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1.256 : 3,14 = r"
400 = r"
akar 400 = r
dan r = 20
maka kel = 2 x 3,14 x 20 = 125,6
1256 = 3,14 .r²
1256/3,14 = r²
400 = r²
r = 20
K = 2r
= 2 * 3,14 * 20
= 125,6