Friday

April 25, 2014

April 25, 2014

Posted by **Richelle** on Saturday, October 29, 2011 at 3:30am.

The surface area of a sphere varies in direct proportion to the square of its radius. If a sphere of radius 6cm has a surface area of 452 square cm, find, to the nearest mm, the radius of a spherewith the surface area 1000 square cm.

- mathematics -
**Damon**, Saturday, October 29, 2011 at 8:14am36/452 = r^2/1000

r^2 = 36/.452

r = 8.9 cm

**Related Questions**

Mathematics - The surface area of a piece of gold is directly proportional to ...

maths - A metal pipe is 63cm long. Inner diameter of a cross section is 6m and ...

mathematics - the pretty perfume company designed a new perfume bottle. The ...

maths - b) if the surface area of the base is increased by times its original ...

Math - Check my answer please? Yuri is wrapping presents. The first box measures...

Mathematics - How to find the volume and surface area of cube and cuboid and ...

Geometry - When finding the surface area of a composite figure, which in this ...

math(again) - the ? says "a cone has the surface area of 160 sq. in. If the ...

Math ASAP - Height: 10 inches Base Perimeter: 40 inches Lateral Surface Area: ...

Math Essay - I have to write this paper over the history of math, can you please...