Divide it to two different shapes again
A triangle and a rectangle is what we get
Area of a rectangle:
Area = Length × Width
= 6 × 4
= 24 cm²
Area of a triangle:
Area =

× base × height
=

× 3 × 6
= 9 cm²
Total Area:
Area of rectangle + Area of triangle
24 + 9
33 cm²