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luas selimut kerucut = 816,4 cm²
garis pelukis (s) = 26 cm
ditanya : volume kerucut ?
jawab :
jari jari (r) ?
luas selimut kerucut = π.r.s
816,4 = 3,14 x r x 26
816,4 = 81,64 x r
r = 816,4/81,64
r = 10 cm
tinggi kerucut (t) :
= √(s² - r²)
= √(26² - 10²)
= √(676 - 100)
= √576
= 24 cm
jadi, volume kerucut :
= 1/3πr²t
= 1/3 x 3,14 x 10 x 10 x 24
= 2512 cm³