Sides that are in the same relative position are called?

Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.

Aplane flies around trip to philadelphia it flies to philadelphia at 220 miles per hour and back home with a tailwind at 280 miles per hour if the total trip takes 6.5 hours how many miles does the plane fly round trip

In the diagram, ab is tangent to c, ab = 4 inches, and ad = 2 inches. find the radius of the circle.