You may choose any of the triangles as they are all the same area in a rectangle. The area of the shaded triangle can be worked out as either \( \frac{1}{4}\,\,\times16.3\,\times\,12.4 = 50.53\,m^{2} ...

The simplest way to work out the perimeter of a 2D shape, is to add the length of all the sides together. A rectangle has two long sides and two short sides. The longest side of this rectangle is ...