The length of sides of triangle PQR are p, q and r units. The length

The length of sides of triangle PQR are p, q and r units. The length of sides of triangle STU are s, t and u units. The following relations hold true: \(p(q+r-p)=s^2\) \(q(p+r-q)=t^2\) \(r(p+q-r)=u^2\) The type of triangle STU is (A) Acute angled (B) Right angled (C) Obtuse angled (D) Either A (...)