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Video: Finding the Area of a Circle Given a Radius

Kathryn Kingham

Work out the area of the circle, giving your answer accurate to two decimal places.<Figure>

01:11

Video Transcript

Work out the area of the circle, giving your answer accurate to two decimal places.

Do you remember the formula for finding the area of a circle? The formula for finding the area of a circle is this: area equals 𝜋 times the radius squared.

In our example with this circle, we’re given the radius; that’s two. Now we can solve. Two squared equals four. Bring down the 𝜋. Four times 𝜋 equals 12.5637, and on and on and on.

We wanna know the area accurate to two decimal places. So we’ll round our area to 12 and 57 hundredths. We weren’t given what units we’re working with, so we can write the final answer as 12 and 57 hundredths units squared.