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

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

    See the steps for problem 8-26.

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

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