Joey uses ten congruent isosceles triangles to create a regular decagon. 

1. What are the three angle measures of one of the triangles? Explain how you know.

   Hint (a):

   See the steps for problem 8-26.

2. If the area of each triangle is $14.5$ square inches, then what is the area of the regular decagon?

   Hint (b):

   The total area is equal to the area of all ten of these triangles.