Question

In an isosceles triangle the base angles are equal. The vertex angles is twice of either base angle.
Set up an equation in the above case.
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Answer 1

Step-by-step explanation:

Let, base angle be "b".

So, vertex angle= 2b

Sum of angles in a triangle= 180 degrees

There are 2 base angles and 1 vertex angle.

So, 

2b+b+b = 180

4b= 180

b=180/4

b=45 degrees.

Therefore,

b=45 degrees

Answer 2

Step-by-step explanation:

Let, base angle be "b".

So, vertex angle= 2b

Sum of angles in a triangle= 180 degrees

There are 2 base angles and 1 vertex angle.

So, 

2b+b+b = 180

4b= 180

b=180/4

b=45 degrees.

Therefore,

b=45 degrees

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