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Finding the area of a circle from the diameter

This math skill teaches how to find the area of a circle using its diameter. The process involves halving the diameter to find the radius, then applying the area formula \( \pi r^2 \), where \( r \) is the radius of the circle.

Learn finding the area of a circle from the diameter

Teaching Transcript

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Let's find the area of this circle with a diameter of 4

We know that the radius is half the diameter, so it would be 2

We also know that the area of a circle is Pi times the radius squared. So let's replace the 'R' in the equation with 2

Solving for area, that's 4 times Pi

Since Pi is about 3.14, 4 times Pi is about 12.56

Skill Practice

Finding the area of a circle from the diameter

Test your understanding of finding the area of a circle from the diameter by practicing it! Work through the below exercises to use it in practice.