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maka:
d = 6x
T = 4x
r = 3x
=
=
=
=
s = 5x
diketahui jumlah garis pelukis dan jarijarinya 56 cm, maka:
s + r = 56 cm
5x + 3x = 56 cm
8x = 56 cm
x = 7
maka:
T = 4x = 28 cm
r = 3x = 21 cm
s = 5x = 35 cm
V kerucut = π r²
= . 21²
= . 441
= . 1386
= 462 cm³