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

Result

r2 =  19.5 cm

#### Solution:

$4 \pi r_2^2 = \pi r^2 \ \\ 4 r_2^2 = r^2 \ \\ 2 r_2 = r \ \\ r_2 = r/2= 39/2 = 19.5 \ \text{ cm }$

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