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 =
![(1)/(2)(\text{Base})(\text{Height})](https://img.qammunity.org/2021/formulas/mathematics/college/vjntho5hrd73rxm3zv5ey9l2ej5v944f30.png)
=
![(1)/(2)(a)(b)](https://img.qammunity.org/2021/formulas/mathematics/high-school/3noi42g9vkzdsjik5nvbdyr2p1fe8cg38n.png)
Area of four right triangles = Area of big square - Area of white square
=
![c^(2)-(b-a)^2](https://img.qammunity.org/2021/formulas/mathematics/high-school/w5kjtuoa52tme0ux8dddg56f9838kj4o8u.png)
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.