Question

In triangle l(pq)=4.5cm ,l(pr)=11.7cm.m angle pqr=90 degree

Answer 1

Your question seems to be incomplete but i am trying to help you by my understanding.

Hope you want to find the third side of the triangle.

Finding it by Pythagoras theorem.

[h² = b² + a² ]

where h is hypotenuse, b is base and a is altitude.

11.7 ² = 4.5 ² + a²

136.89 = 20.25 + a²

136.89 - 20.25 = a²

116.64 = a²

a = √116.64

a = 10.8 cm