10 yellow eggs out of 12 colored eggs

Find the slope of the line passing through a pair of points

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?

Which point has an coordinates of (2,0) ? a