Question

In an isosceles triangle, the base angles are
equal. The vertex angle is twice either base
angle. What is the measure of vertex angle?
b) 60°
d) 100°
a) 45°
c) 90°
plz send solution also​

Answer 1

Since the sum of the interior angles of any triangle adds up to 180∘ and also the base angles of an isosceles triangle are equal,we may let the base angles be x , then the vertex angle is 2x so,x+x+2x=180∘ x=45∘ .

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