Diameter to area

Find the area of a circle whose diameter is 26cm.

Correct result:

A =  530.929 cm2

Solution:

D=26 r=D/2=26/2=13 A=π⋅ r2=3.1416⋅ 132=530.929 cm2D=26 \ \\ r=D/2=26/2=13 \ \\ A=\pi \cdot \ r^2=3.1416 \cdot \ 13^2=530.929 \ \text{cm}^2

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