How to do this question

Dear student

A triangle is possible only if the sum of two sides of a triangle is greater than third side. 
And if we see, in the given triangle,
QR+RP = 3+4 = 7 cm = PQ
Which means the sum of two sides of triangle is equal to third side.
And thus triangle is not possible. Even if we try to draw it will result in a straight line only.

I hope it helps you. If you still have any doubt, please get back to us.
Regards

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