Perimeter The length of the boundary around a figure. Perpendicular Forming a right angle. The position of a single digit in a whole number or decimal number containing one or more digits. The intersection of a plane and a three-dimensional figure. A plane is determined by defining points or lines exisiting on the plane.
Plane figure A two-dimensional figure that lies entirely within a single plane.
Point A location in space that has no length or width. Polygon A closed plane figure whose sides are straight lines and do not cross. The likelihood of an event happening. An impossible event has a probability of zero. An event that will occur with absolute certainty is assigned a probability of one.