Geometry Chapter 1 Vocabulary

Question 1

complementary

Answer 1

2 angles whose sum is 90 degrees

Question 2

supplementary

Answer 2

2 angles whose sum is 180 degrees

Question 3

acute

Answer 3

an angle whose measure is less than 90 degrees

Question 4

obtuse

Answer 4

an angle whose measure is more than 90 degrees

Question 5

right

Answer 5

an angle whose measure is 90 degrees

Question 6

linear pair of angles

Answer 6

angles that share a common vertex, a common ray, and whose other rays form a line

Question 7

vertical angles

Answer 7

angles with a common vertex whose sides form opposite rays

Question 8

collinear

Answer 8

on the same line

Question 9

coplanar

Answer 9

in the same plane

Question 10

adjacent angles

Answer 10

angles with a common vertex and a common side, but no common interior points; angles next to each other

Question 11

compass

Answer 11

a tool used to make arcs and circles

Question 12

protractor

Answer 12

a tool used to measure angles

Question 13

perpendicular lines

Answer 13

lines that intersect to form right angles

Question 14

perpendicular bisector

Answer 14

a line, ray, or segment that perpendicular to a segment and intersects the segment at its midpoint

Question 15

angle bisector

Answer 15

a ray that divides an angle into 2 congruent angles

Question 16

parallel lines

Answer 16

lines in the same plane that will not intersect

Question 17

skew lines

Answer 17

non-coplanar lines that will not intersect