Help needed please an thank you

The surface area of the figure is 177.9714.. units²

Step-by-step explanation:

According to the given diagram, the top part is a square pyramid with each edge length of base as and height as .

So, the lateral surface area of the pyramid  

Now, the bottom part is a square prism with length of edge of base as and height as .

So, the total surface area of four side faces   and the area of base  

Thus, the total surface area of the figure:  

Given that,

Plugging these values

So, the surface area of the figure is 177.9714.. units²