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10-69.

For each diagram below, solve for . Explain what angle relationship(s) you used.

  1. A triangle with interior angles of 3 x + 5 degrees on top, 2 x + 18 degrees at bottom left and 2 x + 17 degrees at bottom right.

    Review the Math Notes box in section 7.1.2

    Since the angles of a triangle add up to , set up an equation using all three angles.

  1. A right triangle with interior angles of x and 30 degrees.