A cylinder with base radius of 8 cm and height of 2 cm is melted to form a cone of height 6 cm. The radius of the cone will be :
Choose the most appropriate option.
A) 8 cm B) 9 cm C) 10 cm D) 11 cm E) None
Sol.   Let the radius of the cone be r cm.   Then, 1/3 ∏ * r² * 6 = ∏ * 8 * 8 * 2   ⇔ r² = [8 * 8 * 2 * 3 / 6= 
<gadget id="calculator">8 * 8 * 2 * 3 / 6</gadget>
<output>64</output>
64   ⇔ r= 8 cm.   8 cmnswer 8 cm
<result>A</result>
A cylinder with base radius of 8 cm and height of 2 cm is melted to form a cone of height 6 cm. The radius of the cone will be :