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28,26 = 3,14 x r²
r² = 28,26 : 3,14
r² = 9
r = akar 9
r = 3
b. L = phi x r²
628 = 3,14 x r²
r² = 628 : 3,14
r² = 200
r = akar 200
r = akar 100x2
r = 10akar2
c. L = phi x r²
7.546 = 22/7 x r²
r² = 7.546 : 22/7
r² = 7.546 x 7/22
r² = 2.401
r = 49
d. L = phi x r²
225phi = 3,14 x r²
225(3,14) = 3,14 x r²
706,5 = 3,14 x r²
r² = 706,5 : 3,14
r² = 225
r = 15