A right angled triangle can never be isosceles.
Question 16 In the given figure, PQ⊥RQ, PQ = 5 cm and QR = 5 cm. Then, △PQR is a) a right-angled triangle but not isosceles b) an isosceles right-angled triangle c) isosceles but not a right-angled triangle d) neither isosceles nor right-angled triangle