Question

13. The vertex angle of an isosceles triangle is four less than twice the base angle. What is the measure of the vertex angle?

Answer 1

Answer:

Let base angle=x°

So, vertex angle=2x-4

Now,x+x+2x-4=180°

because sum of angles of triangle=180°

4x=180-4

x=176/4

x=44

Hence vertex angle=2×44-4

=88-4

=84

Step-by-step explanation:

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