Write the equation of the sinusoidal function shown. Question 6 options: A) y = cos(3x) + 2 B) y = sin x + 2 C) y = sin(3x) + 2 D) y = cos x + 2

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?