Finding the perimeter

This task is about the different perimeters of same-sized shapes.
On the grid below, five different shapes have been shaded in. Each shape has the same area of 6 unit squares.
 
five shapes on a grid

Question

a)  Which shape has the smallest perimeter?

    • shape 1

    • shape 2

    • shape 3

    • shape 4

    • shape 5

Question

b)  Which shape has the greatest perimeter?

    • shape 1

    • shape 2

    • shape 3

    • shape 4

    • shape 5

Question 1Change answer

d)  Complete the statement:
If several figures have an area of 9 squares, the shape which is  has the least perimeter.