Lines and Angles Vocabulary

Front

lines that cross at right angles

Back

perpendicular

Tags

CCSS.HSG.CO.A.1

Front

lines that will never cross

Back

parallel

Tags

CCSS.HSG.CO.A.1

Front

greater than 90 degrees

Back

obtuse angle

Tags

CCSS.4.G.A.1

Front

less than 90 degrees

Back

acute angle

Tags

CCSS.4.G.A.1

Front

lines that cross (but do not form right angles)

Back

intersecting

Tags

CCSS.4.G.A.1

CCSS.HSG.CO.A.1

Front

an angle that is exactly 90 degrees

Back

right angle

Tags

CCSS.4.G.A.1

Front

an angle that is exactly 180 degrees

Back

straight angle

Tags

CCSS.4.G.A.1

Front

the point where two lines meet

Back

vertex

Tags

CCSS.4.G.A.1

Front

the space between two intersecting lines

Back

angle

Tags

CCSS.4.G.A.1

Front

two angles that add up to 90 degrees

Back

complementary angles

Tags

CCSS.7.G.B.5