How to find the area of an isosceles triangle

Isosceles is a triangle whose two sides are equal. The area of this triangle can be calculated by several methods.

Instruction

1. Method 1. Classic.
   
   Area of isosceles triangle can be calculated by the classic formula: polypropelene the base of the triangle to its height.
   
   S=1/2bh
   
   b is the length of the base of the triangle;
   
   h - the length of the height of treugolnika.
2. Method 2. Heron's Formula.
   
   a - length one of the equal sides of the triangle;
   
   b - length of base of triangle.
3. Method 3. It follows from the formula of method 1.
   
   α is the angle between the side and the base;
   
   γ - the angle between the equal sides.