Q3 of 63 Page 20

If the height and slant height of a cone are 21 cm and 28 cm respectively. Find its volume.

We have ,


Height of cone h = 21 cm


Slant height l = 28 cm


Radius of cone = √(l2-h2) = √( 282 – 212) = √343 = 7√7 cm


Volume of cone = 1/3×22/7×7√7×7√7×21


= 2401π cm3


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