Question

in traiangle ABC if AB=BC and angle b is70 find angle A

Answer 1

Answer:

Given: In a Δ ABC, AB = AC and ∠B = 70° ∠B = ∠C [Angles opposite to equal sides are equal] Therefore, ∠B = ∠C = 70° Sum of angles in a triangle = 180° ∠A + ∠B + ∠C = 180° ∠A + 70° + 70° = 180° ∠A = 180° – 140° ∠A = 40°

Answer 2

Answer:

angle A = 55°

Step-by-step explanation:

since, angles opposite to equal sides are equal

angle A = angle C = let x°

according to angle sum property of triangle

angle A + angle B + angle C = 180°

x+70+x= 180°

2x = 110°

x= 55°