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Mathematics, 08.01.2020 02:31 krystalScott17

A(r) is a function that gives the area of a circle with radius r. it can be written in equation form as a(r) = 3.14r2. what is the value of a(5)?
a: 31.40
b: 78.50
c: 28.14
d: 246.49

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