Surface Area and Volume of Sphere

What is the surface area of a solid sphere having a radius of 17.5 cm?

A solid iron ball is melted and 64 smaller solid balls of equal size are made using the entire volume of iron. what is the ratio of the surface area of the larger ball to the sum of surface areas of all the smaller balls?

• 0.25

• 0.5

• 0.75

• 1

Find the surface area of the sphere, given diameter is 10.

• 314.16

• 314

• 166

• 521

If a sphere of radius 3 cm is melted and recast in a wire of radius then find the length of the wire.

• 805 cm

• 225 cm

• 1010 cm

• 1220 cm

• 12.5 cm

• 10.5 cm

• 10 cm

• 12 cm

• 5

• 6

• 7

• 8