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The common endpoint of an angle


two lines that intersect to form right angles


lines that never intersect


part of a line with one endpoint


extends forever in both directions

line segment

part of a line with two endpoints

acute angle

an angle that measures less than 90 degrees

obtuse angle

An angle that measures more than 90 degrees but less than 180 degrees

intersecting line

when 2 lines cross each other

right angle

an angle that measures exactly 90 degrees

straight angle

an angle that measures 180 degrees


the distance around a figure.

vertical line

A line that goes up and down

horizontal line

a line that going from SIDE TO SIDE


the space inside a shape


balance, same on both sides

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