Question

In triangle ABC, if AB=BC and ∠B = 70°, ∠A will be ? (I want explanation also )​

Answer 1

Answer:

Here, The value of angleA will be 55°.

Step-by-step explanation:

Here, As per our given question,

ABC is a triangle, in which AB=BC, angleB=70°

So, Now, As AB=AC

So, angleA=angleC

So, Let the angle be x

=angleA=angleC

=2x+70°=180° (By angle Sum property of triangle)

=2x=180°-70°

=2x=110°

=x=55°

So, The value of angleA will be 55°.

Thank you.

Answer 2

Answer:

55°

Explanation

Here AB=BC. given

lt is an isosceles triangle.

That is angleA=angleC-----(i)

angleA+angleB+angleC=180(angle some property of triangle)

=angleA+angleA+angleB=180° [by using (i)]

=2angleA+angleB=180°

=2angleA+70°=180°

=2angleA=110°

=angleA=55°

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