Geometry Semester 2 Final Study Guide – Flashcards
104 test answers
Unlock all answers in this set
Unlock answers 104question
Kite
answer
A quadrilateral with two pairs of congruent sides and no congruent opposite sides; diagonals are perpendicular; symmetry; longer diagonal line of symmetry.
Unlock the answer
question
Trapezoid
answer
A quadrilateral with exactly one pairs of parallel sides.
Unlock the answer
question
Isosceles Trapezoid
answer
A trapezoid in which the nonparallel opposite sides (leg) are congruent; base angles are congruent; diagonals are congruent.
Unlock the answer
question
Consecutive Angles
answer
Angels that are opposite of each other.
Unlock the answer
question
Base Angles of Trapezoid
answer
The two angles that share a base.
Unlock the answer
question
Mid-segment of a Trapezoid
answer
Line segment connecting the midpoints of the legs; runs parallel to the bases of the trapezoid; its length is the average of the base length.
Unlock the answer
question
Properties of Parallelograms/Prove a Quadrilateral is Parallelogram
answer
Both pairs of opposite sides are parallel; both pairs of opposite sides are congruent; both pairs of opposite angles are congruent; consecutive angles are supplementary; the diagonals bisect each other; show that one pair of sides are simultaneously congruent and parallel.
Unlock the answer
question
Theorem 6-4
answer
If three or more parallel lines cut off congruent segments on one transversal, then they cut off congruent segments on very transversal/
Unlock the answer
question
Properties of a Rhombus
answer
All the properties of a parallelogram; the diagonals bisect the vertex angles; the diagonals are perpendicular.
Unlock the answer
question
Properties of a Rectangle
answer
All the properties of a parallelogram; the diagonals are congruent(distance formula).
Unlock the answer
question
Properties of a Square
answer
All the properties of a parallelogram, rhombus and rectangle.
Unlock the answer
question
Circle
answer
The set of all the points equidistant from the given point.
Unlock the answer
question
Radius
answer
Segment from center to vertex.
Unlock the answer
question
Diameter
answer
A segment that contains the center of the circle and has both endpoints on the circle.
Unlock the answer
question
Central Angle
answer
Formed by two consecutive radii with the center as its vertex; 360/n (n= number of sides).
Unlock the answer
question
Semicircle
answer
Arc whose measure equals 180 degrees; named using three letters.
Unlock the answer
question
Minor Arc
answer
Arc who measure is between 0 and 180 degrees; named using three letters.
Unlock the answer
question
Major Arc
answer
Arc whose measure i s between 180 and 360 degrees; named using three letters.
Unlock the answer
question
Adjacent Arc
answer
Arcs in the same circle with any one point in common.
Unlock the answer
question
Circumference
answer
Distance around a circle; C=(pi)(d) or 2(pi)(r).
Unlock the answer
question
Arc Length
answer
Part of the circle's circumference.
Unlock the answer
question
Congruent Arc
answer
Arcs that have the same measure and length.
Unlock the answer
question
Sector of a Circle
answer
Fraction of a circle, formed by two radii and arc; named same as central angle.
Unlock the answer
question
Segment of a Circle
answer
Formed by arc and segment connecting end points.
Unlock the answer
question
Pythagorean Theorem
answer
(aa)+(bb)=(cc)
Unlock the answer
question
Area of a Rectangle
answer
A=bh
Unlock the answer
question
Area of a Parallelogram
answer
A=bh
Unlock the answer
question
Area of a Triangle
answer
A=1/2bh A= 1/2anSin<C
Unlock the answer
question
Area of a Trapezoid
answer
A=1/2h(b1 + b2)
Unlock the answer
question
Area of a Rhombus of a Kite
answer
A= 1/2(d1*d2)
Unlock the answer
question
Area of a Regular Polygon
answer
A= 1/2ap
Unlock the answer
question
Formula for Arc Length
answer
length of arc AB= measure of arc AB/360 *2(pi)(r)
Unlock the answer
question
Area of a Circle
answer
A=(pi)(r2)
Unlock the answer
question
Area of a Sector of a Circle
answer
measure of arc AB/360 * (pi)(r2)
Unlock the answer
question
Heron's Formula
answer
Find are if given all sides (SSS); are of a triangle; =the square root of(s(s-a)(s-b)(s-c) where s= a+b+c/2.
Unlock the answer
question
45-45-90 Triangle
answer
short leg=x; long leg=x hypotenuse=xroot2
Unlock the answer
question
30-60-90 Triangle
answer
short leg=x: long leg= xroot3; hypotenuse=2x
Unlock the answer
question
Ratio
answer
a comparison of two quantities measured in the same unit; will always be reduced to lowest terms and will have no units.
Unlock the answer
question
Proportions
answer
a statement that two ratios are equal; have three or more ratios are equal then they can be written as an extended proportion.
Unlock the answer
question
Scale Drawing
answer
A drawing that is either an enlargement or a reduction of an object.
Unlock the answer
question
Scale Factor
answer
The amount of enlargement or reduction is referred to as.
Unlock the answer
question
Quadratic Formula
answer
X= -b + - the square root of b2 -4ac/ 2a
Unlock the answer
question
Similar Polygons
answer
All corresponding angles must be congruent; all corresponding sides must be proportional.
Unlock the answer
question
Angle-Angle Similarity Postulate
answer
If two angles of one triangle are congruent to two angles in another triangle, then the triangles are similar.
Unlock the answer
question
Side-Angle-Side Similarity Postulate
answer
If an angle of one triangle is congruent to one angle in another and the sides including the angles are proportional, then the triangles are similar.
Unlock the answer
question
Side-Side-Side Similarity Theorem
answer
If three sides of one triangle are proportional to corresponding sides in another triangle, then the triangles are similar.
Unlock the answer
question
Indirect Measurements
answer
Uses similar triangles and proportions to find distances that would otherwise be difficult to find.
Unlock the answer
question
Geometric Means
answer
A proportion in which the "means" in the proportion have the same value.
Unlock the answer
question
Theorem 8-3
answer
The altitude to the hypotenuse of a right triangle divides the triangle into two triangles that are similar to the original triangle and to each other.
Unlock the answer
question
Side-Splitter Theorem
answer
If a line is parallel to one side of a triangle and intersects the other two sides, then it divides those sides proportionally.
Unlock the answer
question
Corollary to the Side Slitter Theorem
answer
If three parallel ones intersect two transversals then the segments intercepted on the transversal are proportional.
Unlock the answer
question
Triangle-Angle-Bisectors Theorem
answer
If a ray bisects an angle of a triangle, then it divides the opposite side into two segments that are proportional to the other sides of the triangle.
Unlock the answer
question
Similarity Ratio (Scale Factor):
answer
Ratio of corresponding parts of similar figures; comparison of LINEAR elements( lengths).
Unlock the answer
question
SOH-CAH-TOA
answer
Sine=opposite/hypotenuse; cosine= adjacent/hypotenuse; tangent=opposite/adjacent
Unlock the answer
question
Trig inverse
answer
Used to find angle measures
Unlock the answer
question
Angle of Elevation
answer
Is measured upward from the horizontal to line of sight.
Unlock the answer
question
Angle of Depression
answer
Is measure downward from the horizontal to line of sight.
Unlock the answer
question
Polyhedrons
answer
3 dimensional figure whose faces are polygons.
Unlock the answer
question
Faces
answer
Planes
Unlock the answer
question
Edges:
answer
Lines/segments
Unlock the answer
question
Vertices
answer
Points (corners)
Unlock the answer
question
Euler's Formula
answer
F+V=E+2
Unlock the answer
question
Platonic Sides
answer
Regular polyhedrons. They are regular because all of their faces are congruent regular polygons.
Unlock the answer
question
Tetrahedron
answer
4 faces
Unlock the answer
question
Hexahedron
answer
5 faces
Unlock the answer
question
Octahedron
answer
8 faces
Unlock the answer
question
Dodecahedron
answer
12 faces
Unlock the answer
question
Icosahedron
answer
20 faces
Unlock the answer
question
Net
answer
2 dimensional pattern that folds into a 3 dimensional figure.
Unlock the answer
question
Prism
answer
Polyhedron with 2, congruent, parallel faces and regular faces( lateral faces); named by the shape of its base.
Unlock the answer
question
Lateral Area
answer
Area of all lateral faces.
Unlock the answer
question
Surface Area
answer
Area of all faces( lateral faces plus both bases).
Unlock the answer
question
Right Cylinder
answer
A cylinder where the height is a side of the cylinder.
Unlock the answer
question
Oblique Cylinder
answer
A cylinder where the height is outside of the cylinder.
Unlock the answer
question
Lateral Area of a Cylinder
answer
2(pi)(r)(h)
Unlock the answer
question
Surface Area of a Cylinder
answer
2(pi)(r)(h) + 2(pi)(r2)
Unlock the answer
question
Volume of a Cylinder
answer
(pi)(r2)(h)
Unlock the answer
question
Slant Height
answer
The height that comes off of the base of a pyramid of cone that goes to the vertex.
Unlock the answer
question
Lateral Area of a Pyramid
answer
n(1/2sl)
Unlock the answer
question
Surface Area of a Pyramid
answer
n(1/2sl) + s2
Unlock the answer
question
Volume of a Pyramid
answer
1/3Bh
Unlock the answer
question
Lateral Area of Cone
answer
(pi)(r)(l)
Unlock the answer
question
Surface Area of a Cone
answer
(pi)(r)(l) + (pi)(r2)
Unlock the answer
question
Volume of a Cone
answer
1/3/(pi)(r2)(h)
Unlock the answer
question
Sphere
answer
The set of points in space equidistant from a given point(the center).
Unlock the answer
question
Surface Area of a Sphere
answer
4(pi)(r2)
Unlock the answer
question
Volume of a Sphere
answer
4(pi)(r3)/3
Unlock the answer
question
Tangent Line
answer
Line that intersects a circle in exactly one point (called the point of tangency)
Unlock the answer
question
Theorem 11-1
answer
A tangent line is perpendicular to a radius to the point of tangency
Unlock the answer
question
Theorem 11-3
answer
Two segments tangent to a circle from a point outside the circle are congruent.In addition to the two segments being congruent, line AB is congruent to line CB.
Unlock the answer
question
Chord
answer
A segment whose end points are on a circle.
Unlock the answer
question
Theorem 11-4
answer
Within a circle or congruent circles, congruent angles have congruent chords; within a circle or congruent circles congruent chords have congruent arcs; within a circle or congruent circles, congruent arcs have congruent central angles.
Unlock the answer
question
Theorem 11-5
answer
Within a circle or congruent circles, chord equidistant from the center are congruent and congruent chords are equidistant from the center.
Unlock the answer
question
Theorem 11-6
answer
In a circle, a diameter or radius is perpendicular to a chord if and only if it bisects the chord and its arc.
Unlock the answer
question
Inscribed Angles
answer
An angle in a circle whose vertex is on the circle and its sides are chords of the circle. An inscribed angle is never a central angle.
Unlock the answer
question
Theorem 11-9
answer
The measure of a inscribed angle is half the measure of the intercepted arc. Two inscribed angles that intercept tc are congruent. An angle inscribed in a semicircle is a right angle. The opposite angle of a quadrilateral inscribed a circle are supplementary.
Unlock the answer
question
Theorem 11-10
answer
The measure of an angle formed by a tangent and a chord is half the measure of the intercepted arc.
Unlock the answer
question
Inscribed and Circumscribed
answer
A circle is inscribed in a quadrilateral and a quadrilateral is circumscribed around the circle.
Unlock the answer
question
Secant Lines
answer
A line that intersects a circle at exactly two points.
Unlock the answer
question
Theorem 11-11
answer
The measure of a vertical angle formed by two secant line sis half of the sum of the two intercepted arcs; the measure of the angle formed by two secant lines is half of the difference of the intercepted arcs; the measure of the angle formed by a secant line and a tangent line is half of the difference of the intercepted arcs; the measure of the angle formed by two tangent lines is half of the difference of the major arc and the minor arc. M
Unlock the answer