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Ditanya : r = ?
V = 1/3 r² t
==> 64 = 1/3 r² * 12
==> 64 = 4 r²
==> 16 = r²
==> 16/ = r²
==> r = √16/
Jadi, nilai jari - jari kerucut tersebut adalah √16/ = 4√1/
1/3 x phi x r x r x t = 64
1/3 x phi x r x r x 12 = 64
r x r = (64 x 3) : 12 phi
r x r = 192 : 12 phi
r x r = 16 : phi
r = 4 / phi
*catatan*
simbol / (garis miring) dan : (tanda bagi) itu adalah per