If 2 angles are congruent, their supplements are:
  1. Equal
  2. Not equal
  3. Sum up to 90 degree
  4. None of these
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Dear Student,
 
Please follow the solution to the above given query:
If 2 angles are congruent, their supplements are also congruent and equal.

If A and B are supplementary A+B=180° -----(1)
and C and D are supplementary C+D=180° and
if A C. -----(2)

Using (1) and (2), we get  

Then, C + B = 180,
C = 180 - B. Then you can say that 180 - B + D = 180
 D = B
 
Hope this information will clear your doubts about Congruence of triangles.

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