Part 1

Question 1

Parallel Lines

Answer 1

Two lines that do not intersect and are coplanar (on the same plane).

Question 2

Alternate Interior Angles

Answer 2

If a transversal cuts across non-parallel lines, each Alternate Interior Angle is simply the alternate angle to the other.

Question 3

Straight Angle

Answer 3

An angle measuring 180 degrees.

Question 4

Right Angle

Answer 4

An angle measuring 90 degrees.

Question 5

Vertical Angles

Answer 5

Angles that are opposite one another (and congruent) when two lines intersect.

Question 6

Adjacent Angles

Answer 6

Two angles on a plane that share a common vertex and side but have no overlap.

Question 7

Supplementary Angles

Answer 7

Two angles that have a sum of 180 degrees.

Question 8

Complementary Angles

Answer 8

Two angles that have a sum of 90 degrees.

Question 9

Ray

Answer 9

Part of a line consisting of an endpoint and all points on the line extend away from the endpoint.

Question 10

Opposite Rays

Answer 10

Two rays that share a common end point and form a 180 degree angle.

Question 11

Line Segment

Answer 11

Part of a line that consists of two endpoints and a line in-between.

Question 12

Perpendicular Lines

Answer 12

Two lines that intersect at a 90 degree angle.

Question 13

Perpendicular Bisector

Answer 13

A line that intersects a segment at its midpoint creating 90 degree angles and two equal halves of the segment.

Question 14

Segment Bisector

Answer 14

A line, ray or segment which cuts another line segment into 2 equal halves.

Question 15

Angle Bisector

Answer 15

A line or ray that cuts an angle in half, forming two congruent angles.

Question 16

Isosceles Triangle

Answer 16

A triangle with two congruent sides.

Question 17

Equilateral Triangle

Answer 17

A triangle in which all sides are congruent.

Question 18

Scalene Triangle

Answer 18

A triangle in which no two sides are congruent.

Question 19

Right Triangle

Answer 19

A triangle which has a 90 degree interior angle.

Question 20

Hypotenuse (Right Triangle)

Answer 20

The side of a right triangle opposite the right angle- the hypotenuse will also always be the longest side.

Question 21

Legs of a triangle

Answer 21

In a right triangle, the two sides opposite an acute angle. In an isosceles triangle, the two sides that are congruent.

Question 22

Altitude of a Triangle

Answer 22

The distance between the vertex of the triangle and the opposite side (The “y” axis difference between the top and bottom of the triangle).

Question 23

Median of a Triangle

Answer 23

A line segment drawn from one vertex to the midpoint of the opposite side (in an equilateral triangle, from the vertex to the middle of the opposite side).

Question 24

Midpoint

Answer 24

The point halfway between two given points.

Question 25

Linear Pair

Answer 25

A pair of adjacent angles formed by intersecting lines (can be viewed as supplementary angles)

Question 26

Point

Answer 26

Precise location on a plane. A point has no size.

Question 27

Line

Answer 27

Geometric figure (usually containing 2 points) that goes off in 2 directions endlessly.

Question 28

Plane

Answer 28

A flat, 2D surface extending in all directions.

Question 29

Coplanar

Answer 29

Referring to points that lie on the same plane.

Question 30

Collinear

Answer 30

Referring to points that lie on the same line.

Question 31

Skew

Answer 31

Lines in 3D space that do not intersect and are not parallel.

Question 32

Angle

Answer 32

Figure consisting of 2 different rays with the same endpoint.

Question 33

Circle

Answer 33

The set of all points in a plane that are a fixed distance from a given point- The center of the circle.