Each base angle of isosceles triangle is $55^{\circ}$. Vertex angle is

Each base angle of isosceles triangle is $55^{\circ}$. Vertex angle is
  1. $70^{\circ}$
  2. $55^{\circ}$
  3. $110^{\circ}$
  4. $125^{\circ}$

Solution

$180 - 2 \times 55 = 70^{\circ}$.

Asked in: MH-SSC-9

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