Answer: 125
Step-by-step explanation: First you need to find the surface area of triangles which the equation to find it is 1/2(base x height).
1/2(10x5) = 25
Then because there are 4 sides alike you multiply it by 4 which would be 100
In order to find the surface of a square which is relatively easy you would do 5x5 which is 25.
The last step is to add both numbers together which would leave us to your answer 125 I really hope this helped!!