1. a certain tree measures 102.6 feet in distance(the circumference).show how to find the distance straight through the center of the tree(the diameter) without measuring it directly.then find this value to the nearest tenth of a foot.

2. suppose a rope wrapped around earth at the equator(earth's circuference C).then think of adding d feet to the rope's lenght so it can now circle earth at a distance h feet above the equator at all points.

a. write an equation to model this situation.

b. solve d.

c. how much rope do you need to insert if you want the rope to circle earth 500 feet above the equator?