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t = 17 cm
Dit : - L. kerucut ??
- L . selimut kerucut = ??
jawab :
cari r :
k = 2. π . r
132 = 2 . π . r
r = 132 / 2 . 22/7
r =132 / 6,28571428
r = 21 cm
cari s = r² + t²
= 21² + 17²
= 441 + 289
= √730
= 27,01851 cm
- L. kerucut = π . r (s+r)
= 22/7 . 21 (27,01851 + 21)
= 66 . 48,01851
= 3169,22166 cm²
- L. selimut = π . r .s
= 22/7 . 21 . 27,01851
= 1783,22166 cm²