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r = 7 cm
t. kerucut = 31 cm - 7 cm = 24 cm
s. kerucut = √ r² + t²
= √ 7² + 24²
= √ 49 + 578
= √ 625
= 25 cm
Ket: LS = luas selimut, gak pake alasnya yang datar mulus