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

4-130.
  1. A string around a circle is pulled up by a thumbtack, T, as shown below. The string is tangent to the circle with AT = TB. Given that the circle has a radius of r, complete the following problems. Homework Help ✎

    1. Find an expression for the length of the string if AT = r.

    2. How long would the string have to be if arc AB is 120°?

    3. Find mATB.

1.5πr + 2r ≈ 6.712r

60°