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r = √20² - 12²
r = √400 - 144
r = √256
r = 16 cm
L.sel kerucut = x r x s
L.sel kerucut = 3,14 x 16 x 20
L.sel kerucut = 1004,8 cm²
L= 3,14 x 16 x 20
L= 1004.8 cm