1.

In a Δ ABC, if ∠ B = ∠ C = 45°, which is the longest side?

Answer»

In Δ ABC, ∠ B = ∠ C = 45° 

Sum of angles in a triangle = 180° 

∠ A + ∠ B + ∠ C = 180° 

∠ A + 45° + 45° = 180° 

∠ A = 180° – (45° + 45°) 

= 180° – 90° 

= 90° 

∠ A = 90° 

∠ B = ∠ C < ∠ A 

Therefore, BC is the longest side.



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