So hmmm notice the picture below
get the area of the "square" that contains both triangles
and then subtract the area of that gray triangle
notice the base of the triangle, is just 14, the height is 14
the difference, is the area other two blue smaller triangles
get the area of the "square" that contains both triangles
and then subtract the area of that gray triangle
notice the base of the triangle, is just 14, the height is 14
the difference, is the area other two blue smaller triangles