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OpenStudy (anonymous):
Find x and classify each triangle by its angles. Provide the theorem (sum of interior angles or exterior angle theorem) you used to solve the problem.
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OpenStudy (anonymous):
OpenStudy (anonymous):
To find the angle beside 3x - 20, Angle beside = 180 - (3x - 20) * angles in a straight line = 180 * exterior angle Sum of interior angles in triangle = 180 180 = 180 - (3x - 20) + x + 110 x =?
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