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A=πr²

simply π as 3.14 or we could just leave it there and r is the radius.

Diameter is not a radius but simply twice the radius so, divide it by 2

D=2r

14 dm=2r

r=7 dm

Substitute

A=πr²

A=π(7 dm)²

A=49π dm²

If your professor doesn't consider π as a variable multiply by 3.14

A=49(3.14) dm²

A=153.86 dm²

Hope this helps =)