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vertex

the point where two lines meet, sometimes called a corner

right angle

an angle that makes a square corner like the letter L

point

an exact position, used to show an exact number on a line

line segment

a part of a line with two endpoints

acute angle

an angle that is open LESS than a right angle

line

a set of points that is endless in both directions; the arrows represent that it continues to infinity

intersecting lines

lines that cross at one point

parallel lines

lines that NEVER cross, run side by side

ray

a part of a line with one endpoint, then an arrow on the other side

obtuse angle

an angle that is open MORE than a right angle

angle

two rays with the same endpoint