Find each indicated angle measure to the nearest degree.
28
22
?

What is the difference between regular convex and concave polygons

Two cyclists 84 miles apart start riding toward each other at the same. one cycles 2 times as fast as the other. if they meet 4 hours later, what is the speed (in mi/h) of the faster cyclist?

We just started the introduction into circles and i have no idea how to do this.