One winter morning in canada, the temperature at 8.00 pm was at 1.5 degrees c. what expression shows the temperature of degrees c at 5.00 pm?

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?