You can find the area of the entire shape by finding the area of one of the split shapes individually
Formula for Square Area:
Length*Width
6*6=36
The area of the square is 36 in squared
Formula for Right Triangle Area:
Leg A*Leg B/2 (The lines which form the Right Angle)
6*6/2
36/2=18
The area of the right triangle is 18 in squared
Formula for the Equilateral Triangle Area:
Base * Height/2
6*6/2
36/2=18
The area of the equilateral triangle is 18 in squared
Now add all the sums up
36+18+18
=72
The total area of the shape is 72 in squared
Hope this helps!