Working out area

This task is about calculating area.

Question

a) What is the area of the shape above?  
    • 13 cm²

    • 15 cm²

    • 17 cm²

    • 19 cm²

    • 21 cm²

Question

b)  What is the approximate area of the shape above?
    • 18 cm²

    • 20 cm²

    • 22 cm²

    • 24 cm²

    • 26 cm²

Question

c)  What is the approximate area of the shape above?
    • 15 cm²

    • 18 cm²

    • 21 cm²

    • 24 cm²

    • 27 cm²