Exercise 50 Page 722

Let's take a look at the given diagram.

We are given that the sum of the circumferences is 56π. Using this information we can write an equation. 56π=C_K+C_J+C_H Let's recall that the circumference of a circle is twice the product of its radius and pi. 56π=2π r_k+2π r_J+2π r_H By substituting appropriate values for the radii of the circles we can find the value of x.

The value of x is 4. Using this value we can evaluate KJ. Notice that KJ is the sum of the radii of ∘ K and ∘ J.