Multiplication Tables: the product
of two numbers can be represented by the area of a rectangle
where the factors are represented as the dimensions of the rectangle.
Notice each square in the area grid is a unit square.

Area of a rectangle is represented
by a grid of unit squares. Perimeter is the distance around
the outside rectangle.

Area of a square is represented
by a grid of unit squares. Perimeter is the distance around
the outside square.

Area of a parallelogram is represented
by a grid of unit squares. Perimeter is the distance around
outside of the parallelogram.

Area of a rhombus is represented
by a grid of unit squares. Perimeter is the distance around
outside of the rhombus.

Area of a triangle is represented
by a grid of unit squares. Perimeter is the distance around
outside of the triangle.

Area of a trapezoid is represented
by a grid of unit squares. Perimeter is the distance around
outside of the trapezoid.