Area of a triangle PQR right-angled at Q is 60cm².If the smallest side is 8cm long,find the lenght?

The area of a triangle is bh/2 where b (base) is given and you want to find h (height). It is one half the area of a rectangle of the same dimensions.

60 = 4h

h = 15

C^2 = h^2 + b^2 = 64 + 225 = 289

C = 17