Question

I need some help with proofing the attached screenshots, you can choose which proofing method to use in the answer for example the flow chart, the paragraph, or the two-column method. Thanks

Answer 1

1. line r is perpendicular to line s because angle 2 and angle 3 are 90°

2. angle 1 + angle 2 = 90° because angle 3 = angle 1

1. Perpendicular lines are lines that formed 90°.

line r is parallel to line q

therefore;

angle 1 + angle 3 = 180° ( angles on a straight line)

angle 1 + angle 2 = 180°

Therefore angle 2 = angle 3 ( corresponding angles)

angle 2 + angle 3 = 180°

therefore

angle 2 = 90°

angle 3 = 90°

Therefore line r is perpendicular to line s

2. angle DAB is 90° : given

angle 3 + angle 2 = 90

angle 2 = angle 4 ( alternate interior angles)

angle 3 = angle 1( alternate interior angles)

Therefore

substitute angle 3 for angle 1

angle 1 + angle 2 = 90°