How do I do proofs I can't do them

QUESTION POSTED AT 18/04/2020 - 07:43 PM

Answered by admin AT 18/04/2020 - 07:43 PM

Hi Codyh,
we are given the that angle 1 + angle 2 =180 ==> supplementary
and also angle 3+angle 4 =180 ====> also supplementary
since angle 1 is congruent to angle 4
then angle 3+angle 1 =180
but angle 2+angle 1 = 180 as well
it must be then angle 2 is congruent to angle 3
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