Okay so I have looked at this and I think I know how to do it...
since its an irregular shape you need to section it into shapes, so for this you have a square and a rectangle.
So lets start with triangle... (base × height)/2
It looks like the base of the triangle is the side that says 12 for the whole shape. Subtract 5 from 12 you get 7 so the base is 7 The Height is 5 So your equation is... (7 x 7)/2 (49)/7 7
