Chapter 1 vocab

Question 1

acute angle

Answer 1

an angle with a degree measure less than 90

Question 2

adjacent angles

Answer 2

two angles that lie in the same plane, have a common side, but no common interior points

Question 3

angle

Answer 3

the intersection of two noncollinear rays at a common endpoint.

Question 4

angle bisector

Answer 4

a ray that divides an angle into two congruent angles

Question 5

collinear

Answer 5

points that lie on the same line

Question 6

complementary angles

Answer 6

two angles with measures that have a sum of 90

Question 7

congruent

Answer 7

having the same measure

Question 8

coplanar

Answer 8

points that lie in the same plane

Question 9

degree

Answer 9

a unit of measure used in measuring angles and arcs

Question 10

distance (between 2 points)

Answer 10

the length of the segment between 2 points

Question 11

line

Answer 11

a collection of points that extends indefinitely un opposite directions

Question 12

line segment

Answer 12

a measurable part of a line that consists of two points called endpoints, and are all of the points between them

Question 13

linear pair

Answer 13

a pair of adjacent angles whose non-common sides are opposite rays

Question 14

midpoint

Answer 14

the point on a segment exactly halfway between the endpoints of the segment

Question 15

obtuse angle

Answer 15

an angle with a degree measure greater than 90 and less than 180

Question 16

opposite rays

Answer 16

two rays BA and BC such that B is between A and C

Question 17

perpendicular lines

Answer 17

lines that form right angles

Question 18

plane

Answer 18

a plane is a flat surface made up of points that had no depth and extends indefinitely in all direction

Question 19

point

Answer 19

a location

Question 20

ray

Answer 20

a set of points that consists of one endpoint and all the points extending indefinitely in one direction

Question 21

right angle

Answer 21

an angle with the degree measure of 90

Question 22

segment bisector

Answer 22

a segment, line, or plane that intersects a segment at it’s midpoint

Question 23

space

Answer 23

a boundless three- dimensional set of all points

Question 24

supplementary angles

Answer 24

two angles with the measures that have a sum of 180

Question 25

vertex (of an angle)

Answer 25

the common endpoint of an angle

Question 26

vertical angles

Answer 26

two nonadjacent angles formed by two intersecting lines.