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To calculate the area of a circle, use the equation a=pir^2 or area=3.14*radius squared

Insert the known values. We need to find the radius of the circle. Since the radius is half of the diameter, divide the diameter by 2 to get the radius.

The diameter is 20.

20/2=10

Area=3.14*10 squared

Area=3.14*100

Area=314 cm

Hope this helps!

RussianGuy
The formula for area of a circle is A = π r^2.

The diameter of this circle is 20. The radius is half the diameter so the radius is 10.

You substitute 10 for r in the formula to get A = π(10)^2. 10 to the second power is 10 times 10 which is 100 so you get A= π(100). When you multiply π by 100, you get 314.15 which rounded to the nearest tenth is 314.5.

The area of the circle is 314.5 squared centimeters.

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