Formulas

The distance around the shape. The perimeter of a circle is called the circumference

Tip: don't worry so much about the formula for the perimeter of polygons, just remember to add up all the side lengths

The space inside the shape. Think of the space you would paint if your shape was a wall in your home.

Rectangles and squares are parallelograms

The amount of liquid that would fit inside the container. Imagine your shape is a bottle you are filling up.

Tip!

Left to right, you multiply

Right to left, you divide

Tip!

Left to right, you multiply

Right to left, you divide

Tip!

Left to right, you multiply

Right to left, you divide