(Diameter of the circle supposedly below = 20)

Joan determined that the area of the circle below is 400πcm^2. Melinda says that Joan’s solution is incorrect; she believes that the area is 100πcm^2. Who is correct and why?

To find the area of a circle, you have to multiply the radius by the exponent. The radius is the diameter divided by 2. 20 divided by 2 is 10. 10 x 10 + 100 so it is 100

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imlittlestar imlittlestar · Answer 2 · 2019-03-19T02:13:29+01:00

Answer:

Melinda is correct, 100 π cm² may be the area of circle

Step-by-step explanation:

It is given that, the diameter is less than 20.

Therefore radius is always less than 10 (20/2)

If radius = 10 then area = πr² = π(10)² = 100 π cm²

Therefore the maximum value of area is 100 π cm²,

it never be 400 π cm².

Joan determined that the area of the circle below is 400 π cm²

So it is false. Melinda says that Joan’s solution is incorrect; she believes that the area is 100πcm^2.

Therefore Melinda is correct, 100 π cm² may be the area of circle

(Diameter of the circle supposedly below = 20) Joan determined that the area of the circle below is 400πcm^2. Melinda says that Joan’s solution is incorrect; she believes that the area is 100πcm^2. Who is correct and why?

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(Diameter of the circle supposedly below = 20)

Joan determined that the area of the circle below is 400πcm^2. Melinda says that Joan’s solution is incorrect; she believes that the area is 100πcm^2. Who is correct and why?