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Given below are the lengths of the sides...

Given below are the lengths of the sides of three triangles. In each case, determine wheather the triangle is right angled or not.
(i) In `DeltaPQR, PQ=12cm, QR=13cm, PR=5cm`.
(ii) In `DeltaDEF, DE=17cm,EF=15cm, DF=9cm`.
(iii) In `DeltaABC, AB=37cm, BC=12cm, AC=35cm`.

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