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Panoyin
Geometry is about shapes. It includes trigonometry, as well. It also includes angles. It also includes finding equations of angles.
texaschic101
if an angles measure is 90 degrees, then it is a right angle.

if angle a has the same measurement as angle b, then they are congruent angles.

if 2 angles added together equal 180 degrees, then they are supplementary angles.

if a quadrilateral is a square, then it has 4 congruent sides and 4 congruent angles.