9 thoughts on “Math 10, Lesson 19, Problems 12-15”

  1. find angle 1, 2, 3 first
    angle 1+2+3 = 180 degrees because angles 1, 2, and 3 all are in a straight line and straight lines are 180 degrees
    so angle 1 is 112 degrees, which means 180- 112(angle 1)= 68 degrees (angle 2+3)
    angle 2 = 4b, angle 3 =3b+12, which means 4b +3b+12=68, which means b=8, so ang 2 is 32 degrees and ang 3 is 36 degrees.
    to find ang z, interior sides of parallel lines are supplementary, so and w (68) is supplementary to and z, so 180-68=112 degrees
    and z and w has equal 112 degrees because of parallel rules
    hope this helps

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