WILL GIVE BRAINLIST IF CORRECT

If rt is greater than ba, which statement must be true ?

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?

Add. express your answer in simplest form. 12 9/10+2 2/3 = i need u guys to me find the answer to this question