In PQR, P = 70° and R = 30°. Which side of this triangle is the longest? Give reason for your answer.
[PR]
Solution.
In PQR
P + Q +R = 180° (angle sum property)
P = 70° and R = 30° (Given)
70° + Q + 30° = 180°
Q = 80°
Greatest angle is Q and we know that side opposite to greatest angle will be the longest.
Therefore, PR is the longest side