It costs $35 for 2 hours of skiing lessons. how much will it cost for 8 hours of lessons

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?

Find the measure of the angle indicated in bold

Find the center of the circle that can be circumscribed about efg with e(4,4) f(4,2) g(8,2)