In an Isosceles triangle, the two equal sides are called legs and the third side is called as base. The angle which is opposite to the base is called the vertex angle and the point associated with that angle is called as apex. Apex angle of Isosceles triangle is the angle between the lines that joins the pointed end. Use this online calculator to find the apex angle with the given base angle.
If base angle is 56°, what will be the Apex angle of Isosceles triangle?
φ= 180 - (2 x θ)
=180 – (2 x 56)
= 68 °degree