geometry vocab

Question 1

point

Answer 1

a specific location in space named by a letter

Question 2

line

Answer 2

a set of points that extends indefinitely in opposite directions

Question 3

plane

Answer 3

a flat 2D surface that extends indefinitely in all directions

Question 4

line segment

Answer 4

part of a line with 2 endpoints

Question 5

ray

Answer 5

part of a line with 1 endpoint extending indefinitely in opposite direction

Question 6

angle

Answer 6

two rays with a common endpoint called a vertex

Question 7

acute angle

Answer 7

less than 90 degrees

Question 8

right angle

Answer 8

exactly 90 degrees

Question 9

obtuse angle

Answer 9

greater than 90 degrees

Question 10

straight angle

Answer 10

exactly 180 degrees

Question 11

complementary angles

Answer 11

2 angles with a sum of 90 degrees

Question 12

supplementary angles

Answer 12

2 angles with a sum of 180 degrees

Question 13

vertical angles

Answer 13

congruent angles formed by intersecting lines

Question 14

parallel lines

Answer 14

lines in same plane that never intersect

Question 15

perpendicular lines

Answer 15

lines that intersect to form right angles

Question 16

skew lines

Answer 16

lines in different planes that never intersect

Question 17

transversal

Answer 17

a line that intersects parallel lines to form special angle pairs

Question 18

corresponding angles

Answer 18

angles in the same position formed when a third line intersects 2 lines

Question 19

alternate exterior angles

Answer 19

a pair of angles on the outer side of 2 lines cut by a transversal that are on opposite sides of the transversal

Question 20

alternate interior angles

Answer 20

a pair of angles on the inner sides of 2 lines cut by a transversal that are on opposite sides of the transversal

Question 21

polygon

Answer 21

closed plane figures whose sides are line segments

Question 22

congruent figures

Answer 22

figures which are exactly the same

Question 23

adjacent angles

Answer 23

angles that share a common ray

Question 24

perimeter

Answer 24

the distance around a figure

Question 25

circumference

Answer 25

the distance around a circle

Question 26

area

Answer 26

the number of square units inside a plane figure