The surface area of a sphere is same as the curved surface area of a right circular cylinder whose height and diameter are 12 cm each. The radius of the sphere is: Choose the correct choice from the following answers:
A) 4cm
B) 6cm
C) 8cm
D) 10cm
E) 9cm
Explanation:   Curved surface area of sphere =4/πr2Surface area of cylinder =2πrh   4/  2= 
<gadget id="calculator">4/  2</gadget>
<output>2</output>
2πrh=&gt;4/πr2=2πrh   4/  2= 
<gadget id="calculator">4/  2</gadget>
<output>2</output>
2πrh=&gt;r2=6∗12/2   =&gt;r2=36   =&gt;r=6   Note: Diameter of cylinder is 12 so radius is taken as 6.   Option 6cm
<result>B</result>
The surface area of a sphere is same as the curved surface area of a right circular cylinder whose height and diameter are 12 cm each. The radius of the sphere is: