Definition

The distance around the outside of a shape or area, often used in geometry to describe the total length of the edges of a figure.

Example

To find the perimeter of the rectangle, you add up the lengths of all four sides.

Conversation

Have you ever thought about how to calculate the perimeter of your garden?

Not really, but I guess it could help with planning the layout.

Yeah, knowing the perimeter would let you figure out how much fencing you need.

That's a good point! I should measure it out this weekend.

Synonyms & Antonyms

Root Explanation

Perimeter → It is formed from "peri-" (meaning around) and "metron" (meaning measure). The word refers to the measurement around a shape or area.

Memory Tip

Think of measuring something 'around' ('peri-') — that's why perimeter means the distance around a shape.

Visually Confused Words