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Find the area of a circle having a diameter of 14 dm.

Sagot :

The area of a circle is:
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 =)