In ∆PQR p= 1.8cm, q = 2.5cm, r = 3.6cm,calculate p.

Answer 1

p= 1.8cm
If you meant P, then use the law of cosines
p^2 = q^2 + r^2 - 2qr cosP

Answer 2

In angle PQR p=1.8 q=2.5and r=3.6find the angle completely using sin