Chapter 9: Parallel Lines

Question 0

Transversal

Answer 0

A line that intersects two other coplanar lines in two different points

Question 1

Parallel Lines

Answer 1

Lines that do not intersect

2 types:
Lines that have no points in common
Line that have all points in common

Question 2

Alternate Interior Angles

Answer 2

Opposite sides of the transversal

Congruent

Question 3

Alternate Exterior Angles

Answer 3

Opposite sides of the transversal

Congruent

Question 4

Corresponding Angles

Answer 4

One interior and one exterior angle that are on the same side of the transversal
Congruent

Question 5

Interior Angles on the Same Side of the Transversal

Answer 5

Supplementary

Question 6

If two coplanar lines are each perpendicular to the same line, then they are

Answer 6

Parallel

Question 7

Two coplanar lines cut by a transversal are parallel if and only if

Answer 7

the alternate interior angles formed are congruent

Question 8

If two parallel lines are cut by a transversal

Answer 8

then the corresponding angles are congruent

Question 9

If two of three lines in the same plane are each parallel to the third line

Answer 9

then they are parallel to each other

Question 10

If two non-vertical lines in the same plane are parallel

Answer 10

then they have the same slope

Question 11

The sum of the measures of the angles of a triangle is

Answer 11

180

Question 12

The sum of the measures of the angles of a quadrilateral is

Answer 12

360

Question 13

The measure of an exterior angle of a triangle is equal to the sum

Answer 13

of the measures of the nonadjacent angles

Question 14

Isosceles Triangle Theorem

Answer 14

If two sides of a triangle are congruent then the angles opposite these sides are congruent

Question 15

Polygon

Answer 15

A closed figure that is the union of line segments in a plane

Question 16

Convex Polygon

Answer 16

A polygon in which each of the interior angles measures less than 180 degrees

Question 17

Concave Polygon

Answer 17

A polygon in which at least one interior angle measures more than 180 degrees

Question 18

Consecutive

Answer 18

Next to (adjacent)

Question 19

Diagonal

Answer 19

A line segment whose endpoint are two nonadjacent vertices

Question 20

The sum of the measures of the interior angles of a polygon of n sides is

Answer 20

180(n-2)

Question 21

Regular Polygon

Answer 21

A polygon that is both equilateral and equiangular

Question 22

Angle, Angle, Side

Answer 22

If two angles and the side opposite one of them in one triangle are congruent to the corresponding angles and the side in another triangle, then the triangles are congruent

Question 23

Hypotenuse - Leg

Answer 23

If the hypotenuse and a leg of one triangle are congruent to the corresponding parts of the other, then the two RIGHT TRIANGLES are congruent