22/7 circle

Calculate approximately area of a circle with radius 20 cm. When calculating π use 22/7.

Correct result:

S =  1257.14 cm2

Solution:

S=22/7⋅ 202=1257.14 cm2S=22/7 \cdot \ 20^{ 2 }=1257.14 \ \text{cm}^2

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