Question

in a triangle abc if ab=bc and angke b= 70 find angle a​

Answer 1

Answer:

As AB = AC this means ΔABC is isosceles Δ.

So angles opposite to AB and AC are equal.

So ∠B = ∠C = 70°

By Δsum property

∠A + ∠B + ∠C = 180°

∠A = 180° - ∠B - ∠C

     = 180 - 140°

     = 40°

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Answer 2

Answer:

Angle A equals 55°

Step-by-step explanation:

AB = BC

therefore the triangle is isosceles

which means two sides and two angles are equal

angle A = angle C

let angle A and C be x

The sum of all angles of a traingle equals 180°

therefore, A+B+C =180

x+x+70=180

solve this and u get x

x = 55°

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