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busur=45/360.176= 22
b. luas = 22/7.28.28 = 2464
juring = 120/360.2464 = 821,34
= 22/7*56*45/360
= 22
b. L juring = phi*r*r*</360
= 22/7*28*28*120/360
= 821,33