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4.2 Angles of Triangles Objectives: *Apply the Angle Sum Theorem.
*Apply the Exterior Angle Theorem. Mrs. S. Williams
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Angle Sum Theorem The sum of the measures of the angles of a triangle is 180. W + X + Y = 180 X W Y
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Exterior Angle Theorem
The measure of an exterior angle of a triangle is equal to the sum of the measures of the two remote interior angles. 1 = * and 3 are remote interior angles. 3 2 1
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Ex. Angle Sum Theorem Find the missing angle measures. 82° 28° 1 2 63°
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Ex. Exterior Angle Sum Theorem
Find the measure of each numbered angle in the figure. 3 2 1 120° 4 5 50° 56° 78°
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