Question

In triangle ABC, AB = BC, and B = 40°. Find LA​

Answer 1

Answer:

In ∆ABC,

AB = BC

So, Angle B = Angle C. [ Angles opposite to equal sides are equal]

By Angle Sum Property,

Angle (A + B + C) = 180

A + 2B = 180

A = 180 - 2(40)

A = 180 - 80

A = 100°

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Answer 2

Answer:

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