Exercise 9 Page 661

To find the missing side of the triangle, we will use the Pythagorean Theorem. a^2+b^2=c^2In the formula, a and b are the legs and c is the hypotenuse of a right triangle. We are given a triangle with a=x, b=5 and c=16.

Let's substitute these values into the formula and solve for x.

Since a negative side length does not make sense, we only need to consider positive solutions. This means x≈15.20.