Baking a cake

Christy is baking a cake that has a 9 inch diameter. She wants to cover the top of the cake with butter cream icing. How much icing will she need?

Correct answer:

A =  63.6173 in2

Step-by-step explanation:

d=9 in r=d/2=9/2=29=4.5 in  A=π r2=π 292=3.1416 4.52=63.6173 in2

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