Perimeter		A triangle with at least two congruent sides.
Legs		A number from 0 to 1 that indicates how likely an event is to occur.
Base Angles		The distance d 2r of the circle.
Apothem		The angle opposite the base.
Diameter		The angles whose vertices are the endpoints of the base.
Area		Divide the circle into eight c ongruent pie-shaped parts.
Probability		If they have no points in commmon (except for boundary points).
Quadrature		The measure fo each angle of an equilateral triangle is 60 degrees.
Radius		The distance around a circle.
Corollary		The same distance from a given point on a plane.
Non-Overlapping		The set of all points in a plane that are the same distance, r, from a given point in the plane.
Sectors		Each altitude of a triangle from the center of the polygon to a side of the ploygon.
Center		The permeter of a closed plane figure is the distance around the figure.
Isosceles Triangle		The two congruent sides.
Vertex Angle		The distance of r of the circle.
Circumferece		The area of a closed plane figure is the number of non-overlapping squares of a given size that will exactly cover the interior of the figure.
Circle		The area of an enclosed region on a plane can be approximated by the sum of the areas of a number of rectangles.