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9-49.

Use what you know about the angles in a triangle to find in each diagram below. Show all work. Then classify each triangle as acute, right, or obtuse.

By the Angle Sum Theorem, the sum of all interior angles of a triangle is always .

  1. A triangle with angles labeled as follows: x, 40 degrees, and 80 degrees.

  1. A triangle with angles labeled as follows: 96 degrees, x + 12 degrees, and 2 x.