In ΔABC, BC = AB and ∠B=80∘. Then, ∠A=?(a) 50∘ (b) 40∘ (c) 100∘ (d) 80∘

In ΔABC, BC = AB and ∠B=80∘. Then, ∠A=?(a) 50∘ (b) 40�

1.	In ΔABC, BC = AB and ∠B=80∘. Then, ∠A=?(a) 50∘ (b) 40∘ (c) 100∘ (d) 80∘
Answer» $I n Δ A B C, BC = AB and ∠ B = 80^{\circ} . T h e n, ∠ A = ? (a) 50^{\circ} (b) 40^{\circ} (c) 100^{\circ} (d) 80^{\circ}$