Answer:
Option (3)
Explanation:
From the picture attached,
Area of white square = (side)²
Length of each side of the white square = (b - a)
Area of white square = (b - a)²
Area of each right triangle =

=

Area of four right triangles = Area of big square - Area of white square
=

Since area of 4 right triangles = 4(Area of each right triangle)
c² - (b - a)² =
![4[(1)/(2)(ab)]](https://img.qammunity.org/2021/formulas/mathematics/high-school/443tbnjhpfsh4cda4dpuke6r9dlleq4949.png)
Therefore, Option (3) will be the answer.