10 terms

equilateral triangle

A three sided polygon with all three sides equal in length.

isosceles triangle

A three sided polygon with at least two sides the same length.

scalene triangle

A three sided polygon that has three different side lengths.

congruent

Having the exact same size angles, side lengths, and shape.

polygon

A closed, 2-dimensional figure made up of straight line segments joined at points.

regular polygon

A polygon whose sides are all the same length and whose angles are all equal.

convex polygon

A polygon in which all verticies are "pushed outward".

concave polygon

A polygon with which at least one vertex is "pushed in".

quadrilateral

A polygon that has four sides.

parallelogram

A quadrilateral with two pairs of parallel sides and opposite sides congruent.