### Home > PC > Chapter 4 > Lesson 4.3.1 > Problem 4-130

4-130.

A string around a circle is pulled up by a thumbtack, , as shown below. The string is tangent to the circle with

*. Given that the circle has a radius of*

*, complete the following problems.*

Find an expression for the length of the string if

.How long would the string have to be if

is ? Find

.