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r = 6 cm
a) luas selimut = x r x s = 3,14 x 6 x 10 = 188,4
b) luas alas = x = 3,14 x = 3,14 x 36 = 113,04
c) luas sisi kerucut = luas selimut + luas alas = 188,4 + 113,04 = 301,44