In APQR, PQ = 19 cm, QR = 24 cm and PR = 30 cm.
Show that APQR is not a right-angled triangle.
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PQ ×2 = Qr ×2 + PQ ×2
30×2 =24×2 + 19×2
900=576 + 361
hence, if h×2 =b×2 +p×2
900≠937
means that is not a right angled triangle.
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