###
midpoint

If a point is a midpoint then it divides the segment into two congruent segments.

###
angle bisector

if a ray bisects an angle then it divides the angle into two congruent angles.

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trisect

if two points trisect a segment then they divide the segment into three congruent segments.

###
angle trisector

if two rays trisect an angle then they divide the angle into three congruent angles.

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congruence

if two angles (or segments) have the same measure then they are congruent.

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perpendicular

if two lines are perpendicular then they form a right angle.

###
complementary

if two angles sum to a right angle then they are complementary

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acute angle

if an angle measures between 0 degrees and 90 degrees then it is an acute angle.

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obtuse angle

if an angle measures between 90 degrees and 180 degrees then it is an obtuse angle.

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supplementary

if two angles sum to a straight angle then they are supplementary.

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right angle

if an angle measures 90 degrees then it is a right angle.

###
straight angle

if an angle measures 180 degrees then it is a straight angle.

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