Monday

July 28, 2014

July 28, 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**

math - direct variation the surface area of a sphere varies directly as the ...

Geometry/Algebra/Calculus - Why isn't the surface area of a sphere with radius r...

geometry - The radius R of a sphere is 5.6cm. Calculate the sphere's surface ...

calculus *improper integrals* - A hole of a radius of 1cm is pierced in a sphere...

Algebra - the surface area of a sphere is a=4 pie r squared where r is the ...

MAth - A sphere has a surface area of 28.26 in2. Find the diameter in inches, of...

calculus - A hole of a radius of 1cm is pierced in a sphere of a 4cm radius. ...

college physics - Two solid spheres A and B are made from the same material. The...

college physics - Two solid spheres A and B are made from the same material. The...

physics - Two solid spheres A and B are made from the same material. The mass of...