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p×l= 28×20= 560
πr2= 2×22/7×7×7= 308
L bangun yg diarsir = 560-308= 252 cm2
69.
10+13+31+6= 60
2πr= 2×22/7×14×1/4= 22
2πr= 2×22/7×7×1/4= 11
K bangun yg diarsir = 60+22+11= 93 cm