If a cone is divided into two parts by drawing a plane through the midpoints of its axis, then the ratio of the volume of the 2 parts of the cone is
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Correct answer: C
Explanation
The correct answer is option 3
R = 2l
H = 2h
R/r = H/h = 2
Volume of small cone/volume of big cone = (1/3 πr2h)/(1/3 πr2H)
=(r/R)2 × (h/H) = (1/2)2 × 1/2 = 1/8
Vol. of part I/Vol. of part II = 1/8-1 = 1/7
Required ratio 1 : 7