Geometry

Perimeter is the rim

Perimeter is the rim

Helps you remember perimeter is the distance around the edge.

✨ Tap to flipPerimeter is the rim

When to use it

Use it to distinguish perimeter from area when a problem asks how far it is around a shape.

Example

A rectangle 4 cm by 6 cm has a perimeter of $4 + 6 + 4 + 6 = 20$ cm, the total length of all four sides.

Common mistake

Calculating area instead of perimeter. Perimeter is adding all side lengths, not multiplying them.