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= √(9² + 12²)
= √(81 + 144)
= √225
= 15 cm
Luas selimut kerucut = π × r × s
= 3,14 × 9 × 15
= 423,9 cm²
jari-jari= 9cm
tinggi= 12cm
dit: luas selimut..
pertama cari terlebih dahulu nilai s(panjang garis pelukis)
s = √(r² + t²)
= √(9² + 12²)
= √(81 + 144)
= √225
= 15 cm
kemudian Luas selimut kerucut = π × r × s
= 3,14 × 9 × 15
= 423,9 cm²