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Question -

ABCD is a square. AC and BD intersect at O. State the measure of ∠AOB.



Answer -

The figure can be drawn as follows:
 
In  and ,
  (Sides of a square are equal)
  (Diagonals of a parallelogram bisect each other)
  (Common)
So, by SSS Congruence rule, we have
 
Also,
  (Corresponding parts of congruent triangles are equal)
But,   (Linear pairs)
We have, 
 
Hence, the required measure of  is  .

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