Definition

A tool used to measure the area of a flat shape by following its edges with a pointer.

Example

The architect used a planimeter to calculate the area of the land for the new building.

Conversation

I just got this new tool called a planimeter for my geometry project.

Oh, cool! What does it do?

It helps measure the area of shapes by tracing their boundaries.

That sounds really useful! I could use one for my next art project.

Synonyms & Antonyms

Root Explanation

Planimeter → It is formed from "planus" (meaning flat or level) and "metron" (meaning measure). A planimeter is an instrument used to measure the area of a flat surface.

Memory Tip

Think of measuring a 'flat' area ('planus') with a tool that 'measures' ('metron'). This helps you remember that a planimeter is used to measure flat surfaces.

Visually Confused Words