Given that in ΔABC, ∠A = 40° and ∠B = 60°
We have to find longest and shortest side
We know that,
Now,
⇒ 40°<60°<80° ⇒ ∠A < ∠B < ∠C
⇒ ∠C is greater angle and ∠A is smaller angle
Now,
∠A < ∠B < ∠C
BC < AC < AB
[∵ Side opposite to greater angle is larger and side opposite to smaller angle is smaller]
∴ AB is longest and BC is smallest or shortest side.