Perimeter to area

Calculate the area of a circle with the perimeter 15 meters.

Correct result:

S =  17.905 m

Solution:

o=15 r=o/(2π)=15/(2⋅ 3.1416)≐2.3873 S=π⋅ r2=3.1416⋅ 2.38732=17.905 mo=15 \ \\ r=o / (2 \pi)=15 / (2 \cdot \ 3.1416) \doteq 2.3873 \ \\ S=\pi \cdot \ r^2=3.1416 \cdot \ 2.3873^2=17.905 \ \text{m}

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