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Phi x D x 45/360= 11
22/7 x D x 1/8= 11
22/56 x D = 11
D = 11 x 56: 22
D = 28
r = 14
Luas Juring
L. Juring = Phi x r x r x 45/360
L. Juring = 22/7 x 14 x 14 x 1/8
L. Juring = 77
Semoga Bermanfaat :-)