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K.trapesium = 15+19+17+27 = 78 cm
K.stengah lingkaran = 1/2×2××r = 1/2×2×22/7×7 = 5,5 cm
Keliling arsiran = K.trapesium-K.stengah lingkaran = 78-5,5 = 72,5 cm
~jadikan yang terbaik please~