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Adding Angles

Adding Angles. When you want to add angles, use the notation m  1 , meaning the measure of  1. If you add m  1 + m  2, what is your result? m  1 + m  2 = 58 . m1 + m2 = mADC also. Therefore, mADC = 58. Angle Addition Postulate. Postulate:.

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Adding Angles

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  1. Adding Angles • When you want to add angles, use the notation m1, meaning the measure of 1. • If you add m1 + m2, what is your result? m1 + m2 = 58. m1 + m2 = mADC also. Therefore, mADC = 58. Lesson 1-4: Angles

  2. Angle Addition Postulate Postulate: The sum of the two smaller angles will always equal the measure of the larger angle. Complete: m  ____ + m ____ = m  _____ MRK KRW MRW Lesson 1-4: Angles

  3. Example: Angle Addition K is interior to MRW, m  MRK = (3x), m KRW = (x + 6) and mMRW = 90º. Find mMRK. First, draw it! MRK + KRW = MRW 3x + x + 6 = 90 4x + 6 = 90 – 6 = –6 4x = 84 x = 21 3x x+6 Are we done? mMRK = 3x = 3•21 = 63º Lesson 1-4: Angles

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