1,4,7m

1,3,10m

1,4,7,6.1m

The total area of the shaded regions is equal to the area of the triangle times the area of the square.

The total area of the shaded regions is equal to the area of the square minus the area of the triangle.

The total area of the shaded regions is equal to the area of the triangle minus the area of the square.

The total area of the shaded regions is equal to the area of the square plus the area of the triangle.

30 m

18 m

9m