Angle: The shape formed by two rays (called sides of the angle) with the same endpoint (called the vertex of the angle). In geometry an angle can be defined by the vertex or by the rays and vertex
Perimeter: The distance around a figure
Area: number of square units need to cover a surface. (formula for area = length x width)
Parallelogram: a quadrilateral with parallel and congruent opposite sides.
Parallel lines: Lines that are always the same distance apart, they never cross.
Triangle: A polygon with three sides and three angles
Base: a side of a polygon
Height: the length of the perpendicular line segment from the vertex to the base of the triangle.