In this problem, we want to apply special right triangles.
We will take a close look at the 30-60-90 triangle:
When working with this special right triangle, we can apply the following ratio for the legs and hypotenuse:

As long as we know one of the three legs, we can find the missing legs as well.
We are given the following diagram:
It looks like we were given the hypotenuse. Using our ratio above, we see:

Let 10 be equal to the hyptonuse length from the ratio.

Solve for x by dividing by 2:

Since know a = x,

We can find b the same way:
