9th grade geometry- On the unit circle, the radius is 1. We found the coordinates of common angles such as 30°, 60°, 45°, and 90°. What would be the coordinates of a 22° angle? Round coordinates to the nearest hundredth. (Hint: Draw a picture and think of the unit circle stuff)

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?

I’m really confused and need to learn this

Find the arc length of the semicircle. 7the grade