Find the area of isosceles triangles quiz. Isosceles triangles are triangles that have at least two equal sides. They technically feel like two right triangles joined together at a central point that makes each one symmetrical to the other. Finding the area will be the same like the formula used in finding the area of right triangles multiplied by two incase each part of the triangle is taken as a right triangle. However there is a much simple and straight forward formula which can be applied. Solve each problem and track your score at the end of the quiz. This is a geometry exercise for students in 4th, 5th, 6th, and 7th grade.