Chapter 2.1 - 2.3

Question 1

Ray

Answer 1

Ray AB consists of the initial point A and all points on the line segment AB that lie on the same side of A as B lies

Question 2

Opposite Rays

Answer 2

If C is between A and B then Ray CA and Ray CB are opposite rays

Question 3

Line segment

Answer 3

Line AB consist of the end points A and B and all points on the line AB that lie between A and B

Question 4

Collinear

Answer 4

Points, segments, or rays that lie on the same line are collinear

Question 5

Angle

Answer 5

An angle consists of two different rays that have the same initial point. The rays are the sides of the angle in the initial point is the vertex of the angle

Question 6

Acute angle

Answer 6

An acute angle is an angle with measure greater than 0° and less than 90°

Question 7

Right angle

Answer 7

An angle with a measure of 90°

Question 8

Obtuse angle

Answer 8

An angle with a measure greater than 90° and less than 180°

Question 9

Straight angle

Answer 9

An angle that measures 180°

Question 10

Interior of an angle

Answer 10

Every nonstraight angle has an interior. A point D is in the interior of angle A if it is between points that lie on each side of the angle

Question 11

Exterior of an angle

Answer 11

Every nonstraight angle has an exterior. A point D is in the exterior of angle A if it is not on the angle or in the interior of the angle

Question 12

Adjacent angles

Answer 12

Two angles are adjacent if they share a common vertex and side, but have no common interior points

Question 13

Segment addition postulate

Answer 13

If B is between A and C then AB+BC= AC

Question 14

Angle addition postulate

Answer 14

If C is in the interior of angle AOD, then the measure of angle AOC plus the measure of angle COD equals the measure of angle AOD

Question 15

Congruent segments

Answer 15

Two segments are congruent if they have the same length

Question 16

Congruent angles

Answer 16

Two angles are congruent if they have the same measure

Question 17

Midpoint

Answer 17

The Point that divides the segment into two congruent segments

Question 18

Segment bisector

Answer 18

A segment, ray, line, or plane that intersects a segment at its midpoint

Question 19

Angle bisector

Answer 19

A ray that divides the angle into two congruent angles

Question 20

Perpendicular lines

Answer 20

Two lines are perpendicular if they intersect to form a right angle

Question 21

A line is perpendicular to a plane if…

Answer 21

It is perpendicular to each line in the plane that intersects it