This is one of the sides of a shape. The area of one full small square is $1 \mathrm{square} \mathrm{cm}$. Complete the shape so that its area is $4 \mathrm{square} \mathrm{cm}$.

Here is a rectangle of area $20 \mathrm{square} \mathrm{cm}$.

 Draw one straight line in this rectangle to divide it into two equal triangles. What is the area of each of the triangles$?$

Here is a rectangle of area $20 \mathrm{square} \mathrm{cm}$.

Draw one straight line in this rectangle to divide it into two equal rectangles. What is the area of each of the smaller rectangles$?$

Draw two straight lines in this rectangle to divide it into one rectangle and two equal triangles. What is the area of the rectangle$?$ What is the area of each of the triangles$?$(consider area of one small square is equal to $1 \mathrm{square} \mathrm{cm}$)

How many different shapes can you draw using $5$ squares$?$

Figure (d) has the smallest perimeter, find the perimeter of the remaining figures in $\mathrm{cm}$ where perimeter of remaining figures are same(Consider side of a small square has $1 \mathrm{cm}$).

Each square area in the given diagram is of $1 \mathrm{square} \mathrm{cm}$. If the area of the each shape is $k \mathrm{square} \mathrm{cm}$, find the value of $k$.