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176= 2×22/7×r
176×7=44×r
1232=44×r
r=28
d=2r=2(28)=56
176 = 3.14 × r x r
176 = 3.14 × r2
176 : 3.14 = r2
56 = r2
akar 56 = r
mohon maaf kalau salah