Remember the following formulae:
Area of a rectangle = length × width
The area of this rectangle is 11cm x 4cm = 44cm2
Area of a parallelogram = length × perpendicular height
The area of this parallelogram is 8cm x 3cm = 24cm2
Area of a triangle = base × perpendicular height ÷ 2
(This is because you can fit two triangles inside a rectangle.)
The area of this triangle is (12cm x 8cm) ÷ 2 = 48cm2