Question

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A circle has a diameter of 28 centimeters. Estimate the area of the circle. Use 22/7 for π.
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Answer 1

616 cm²

Explanation:

To find the area of a circle you use the formula A = π · r²

So we know that the diameter is 28 cm, to find the radius we would divide this in half, because d = 2r, giving us 14. Now we can do 14² which is 196, and then times that by pi or in this case 22/7.

196 × (22/7) = 616

Answer 2

616 square centimeters

Explanation:

Diameter of circle = 28 centimeters

π = 22/7

Area of a circle, A = π
`(D^(2) )/(4)`

A =
`(22)/(7)` *
`(28^(2) )/(4)`

A =
`(22)/(7^(1) )` *
`((4 * 7)^(2) )/(4)`

A =
`(22)/(7^(1) )` *
`(4^(2) *7^(2) )/(4)`

A = 22 * 28

A = 616 square centimeters