If the area of a circle is 70cm^2,find the radius?

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Answer 1 · 2018-05-15T16:45:44

r = ~4.72 cm

Area of Circles

$A = π r^{2}$ $A = pir^2$

$70 = π r^{2}$ $70 = pir^2$

Divide by pi to get $r^{2}$ $r^2$ isolated.

$\frac{70}{π} = r^{2}$ $70/pi = r^2$

Now, find the square root:

$\sqrt{\frac{70}{π}} = r$ $sqrt(70/pi) = r$

$r$ $r$ = 4.72034871941