What is a diagonal cross section through the widest part of a sphere

Which expression gives the area of the triangle shown below

Math i have no idea how to do a and b

You just purchased two coins at a price of $670 each. because one of the coins is more collectible, you believe that its value will increase at a rate of 7.1 percent per year, while you believe the second coin will only increase at 6.5 percent per year. if you are correct, how much more will the first coin be worth in 15 years?