Quadrant II

Calculate the radius of the quadrant, which area is equal to area of circle with radius r = 15 cm.

Correct result:

r2 =  20.5 cm

Solution:

r=41 cm  S1=S2 4 πr22=πr2 4 r22=r2  2 r2=r  r2=r/2=41/2=412=412 cm=20.5 cm

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