Question

In triangle ABC if BAB=BC and B=70° ​

Answer 1

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Answer 2

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If AB=BC and <B=70⁰

hence by angle sum property

<A+<B+<C=180⁰

As AB=BC and <B=70⁰ so <C=70⁰(Angles opposite to equal sides of a triangle are equal to one another)

So 140⁰+<A=180⁰

<A=40⁰