1.

In Δ ABC, if ∠ A = 40° and ∠ B = 60°. Determine the longest and shortest sides of the triangle.

Answer»

In Δ ABC, ∠ A = 40° and ∠ B = 60° 

We know, sum of angles in a triangle = 180° 

∠ A + ∠ B + ∠ C = 180° 

40° + 60° + ∠ C = 180° 

∠C = 180° – 100° = 80° 

∠ C = 80° 

Now, 40° < 60° < 80° 

∠ A < ∠ B < ∠ C 

∠ C is greater angle and ∠ A is smaller angle. 

Now, ∠ A < ∠ B < ∠ C 

We know, side opposite to greater angle is larger and side opposite to smaller angle is smaller. 

Therefore, BC < AC < AB 

AB is longest and BC is shortest side.



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