# The surface area of 2 spheres is a ratio of 64:729. What is the ratio of their radii?

##### 1 Answer

Dec 12, 2017

8:27

#### Explanation:

The surface area of a sphere is given by

Let r1 be the radius of the first sphere, and r2 be the radius of the second.

The problem statement gives us:

...you can see that the

therefore:

Take the square root of everything you see:

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