how do you derermine the area of an isosceles triangle
an isosceles triangle is divided into 2 right triangles by an altitude.
If the length of a side of the isosceles triangle is a you can calculate the height by the Pythagorean theorem:
The area of a triangle is calculated by:
where s is the base side and is the height of the triangle perpendicular to s. Plug in the values you know about the isosceles triangle: