How many 1 degree turns do you need to create a 90 degree angle? lot of ! 29

Write the fraction 9/50 as a decimal if needed round to the nearest hundredth

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 length of the normal and the angle it makes with the positive x-axis. (see pictured below)