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SUDUT AOB = 108 SUDUT COD = 72
JARI2 LINGKARAN B = 10 CM JARI2 LINGKARAN K = 1/2 JARI2 B
= 1/2 10 = 5 CM
L. JURING AOB = 108 / 360 X L. LINGKARAN B
= 3 / 10 X 314
= 94,2 CM²
L. JURING COD = 72 / 360 X L. LINGKARAN K
= 1/ 5 X 314
= 15,7
L. YG DIARSIR = 94,2 - 15,7 = 78,5 CM²