The end answer is 40.75cm^2 (squared)
How i got there was i used the equation
1/2 (a×b ) + 3/2 (b×s)
where A is the height of the base triangle
Where b is the side length (it does not matter which one but it is one of the 5's)
The second b stands for the same thing.
Where S represents the height of the pyramid.
So then we get this:
1/2 (4.3 × 5) + 3/2 (5 × 4)
you solve the parentheses first and so on and so on.
I hope this helps!! Have a good day and remember to be tiger fierce!! :p