Question 399062: if i am doing indirect proofs could you please explain it to me how to do them because my teacher stinks, she just taught us this yesterday and now we have a test on it, for example,
write an indirect proof,
given:trapezoid ABCD with segment AB parallel to segment DC
prove: angle C and angle D are not both right angles
Answer by richard1234(7193)   (Show Source):
You can put this solution on YOUR website! You assume that angles C and D equal 90 degrees, then show that a contradiction occurs. In this case, since angle B + angle C = 180, and angle A + angle D = 180 (due to the fact that AB and CD are parallel), then all four angles are equal to 90, and you have a rectangle, which by definition, is not a trapezoid.
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