Sketch and label a linear pair. Angle Addition Postulate Example And finally, just like we saw with segments, angles also have bisectors. Each pair form supplementary angles because their sum is 180^o. Vertical Angles. Corresponding angles. 30 seconds . Theorem 3-13 If two lines are perpendicular, then they intersect to form four right angles. The sum of the interior angles of a triangle is 180º. One of the angles in the pair is an exterior angle and one is an interior angle. 3 4 7 8 2. I feel like dividing by 3. Exterior Angle. 1 2 75 8 EXAMPLE 3 Find Measures of Alternate Exterior Angles Use Angle Relationships LOOK BACK To review linear pairs, see p. 75. ma1 1 ma2 5 180 8 Linear Pair Postulate ma1 1 75 8 5 180 8 Substitute 75 8 for ma2. Symmetric Property. a. and are supplementary and add up to . Example: Prove that if two parallel lines are cut by a transversal, then the pairs of alternate interior angles are congruent. Linear pairs are so important in geometry that they have their own postulate. October 10, 2011 theorem: proven statement Linear Pair Theorem: If two angles form a linear pair, then they are supplementary. answer choices . What are the m
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