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Acute triangle
three acute angles, all three angles measure less than 90°.

auxiliary line
a line added to a diagram to help solve a problem or prove a geometric concept

base angles
an angle in a polygon, most commonly a triangle, that is formed at the end of the base side. In an isosceles triangle, the two angles opposite the congruent sides (legs) are equal and are both called base angles

congruence transformation
a geometric movement that preserves the size, shape, and angles of an object, resulting in a congruent image.

congruent polygons
polygons with the exact same shape and size

coordinate proof
uses the coordinate plane to prove geometric statements by algebraic formulas, (distance formula and slope formula) to the coordinates of the figure's vertices

corollary
a statement that is a direct and easy-to-prove consequence of a previously proven theorem

corresponding parts
the matching points, sides, or angles in two figures that are in the same relative position to each other

flow proof

remote interior angles
the two interior angles of a triangle that are not adjacent to a specific exterior angle
