Answer: 15 square units.
Explanation:
From the given figure, we have a polygon in which there are 5 triangular regions having equal area.
The area of each triangle = 3 square units.
Then , the area of the polygon is given by :-
![\text{Area of polygon}=5*3\\\\\Rightarrow\ \text{Area of polygon}=15\text{ square units}](https://img.qammunity.org/2020/formulas/mathematics/middle-school/va68ge18fj6ha6dqpr21ivoajsgbebnph3.png)
Hence, the area of the whole polygon = 15 square units.