Question

in triangle pqr , angle p = 70°, angle r= 30°. which side of this triangle is the longest ? give reasons for your answer.

Answer 1

angles P+Q+R=180
70+Q+30=180
Q+100=180
Q=80 degree

As you see angle Q is the largest. therefore opposite side of angle Q is longest and opposite side of angle Q is PR. Therefore PR is longest side of triangle PQR.