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s² = (3,5)² + (12)²
s² = 12,25 + 144
s² = 156,25
s = √156,25
s = 12,5 cm
Luas sisi kerucut
L = x r (r + s)
L = x 3,5 (3,5 + 12,5)
L = x 3,5 x 16
L =
L = 176 cm²