A line connects points A and B ( -5,5 and -5,-3) as shown below. If a third point, C, is plotted six units to the right of point B, what will be the area of the resulting right triangle?

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?