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13 th = 40×72/360=8 anak
10 th = 40×36/360=4 anak
11 th = 40×162/360=18 anak
10+8+4+18 = 40
maaf klo slh dan semoga membantu
B.72°/360°×40=648
C.36°/360°×40=324
maaf klo slah