SAT Lines, Angles, and Triangles study notes

Angle drawings are clues, not measurements. Use the rules: a straight line is 180°, a triangle’s interior angles total 180°, and vertical angles are equal. Mark what you know on the diagram and work from a total.

Worked example

A triangle has angles 38° and 67°. What is the third angle?

Subtract from 180°: 180 − 38 − 67 = 75°. The sketch might look different, but the angle sum controls the answer.

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