Question

In the figure given above
∠A = ∠C
∠B = 120°
BC = 4cm

i) AB=?
ii) ∠A=30°
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Answer 1

Answer:

ab=4cm

Step-by-step explanation:

∠A = ∠C ,

∠B = 120 °

BC = 4 cm

find AB  

clearly ,

∠A + ∠B + ∠C = 180 °

2 ∠A + 120° = 180°

2∠A = 60°

∠A = 30°

∵ ∠A = ∠C

∴ ∠C = 30°

now , AB = BC

∴AB = 4 cm