# Area of a Circle

## Prompt

“Write down an integral for the area of a circle of radius 2.”

## Context

This SWBQ introduces the use of curvilinear coordinates.

## Wrap Up

Discuss different ways of chopping up the interior of a circle, such as:

• Using vertical strips (the area between curves) and single integration;
• Using small rectangles and double integration;
• Using annuli (the area between circles) and single integration;
• Using polar rectangles and double integration.

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