Radius

Find the radius of the circle with area S = 200 cm².

Correct result:

r =  7.979 cm

Solution:

S=200 cm2 S=πr2  r=S/π=200/3.1416=7.979 cmS=200 \ \text{cm}^2 \ \\ S=\pi r^2 \ \\ \ \\ r=\sqrt{ S/\pi }=\sqrt{ 200/3.1416 }=7.979 \ \text{cm}

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