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r=......?
L=
962,5 = *
= 962,5 *
= 306.25
r =
r = 17.5 cm
L = π r²
r = √(L/2π)
= √(962,5/22/7)
= √962,5 X 7 / 22
= √ 306.25
= 17.5 cm