What is the formula to calculate the area of a circle with radius r?
Understand the Problem
The question is asking for the formula that represents the area of a circle based on the radius, indicating the options provided. It requires knowledge of geometry to identify the correct formula.
Answer
A = πr²
The formula to calculate the area of a circle with radius 'r' is A = πr².
Answer for screen readers
The formula to calculate the area of a circle with radius 'r' is A = πr².
More Information
The area of a circle can be determined by multiplying pi (π) with the square of the radius (r). The unit of area is in square units.
Tips
A common mistake is to confuse the formula for the circumference of a circle with the formula for the area, using 2πr instead of πr².
Sources
- Area of a Circle - Formula, Derivation, Examples - Cuemath - cuemath.com
- The web page with info on the formula for area of a circle - Khan Academy - khanacademy.org
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