Need asap 80 p0ints what is the value of x? enter your answer in the box. units triangle f s b with f s equal to 38 and f b equal to 55. triangle z d r with z d equal to 15.2 and z r equal to x.

You are standing next to a really big circular lake. you want to measure the diameter of the lake, but you don't want to have to swim across with a measuring tape! you decide to walk around the perimeter of the lake and measure its circumference, and find that it's 400\pi\text{ m}400? m. what is the diameter dd of the lake?