The length of the rectangular blackboard is three times its width. If the width is $1.5 \mathrm{m}$, find its area. Also find, the cost of painting the blackboard a the rate of $₹5.5$ per $\mathrm{sq}.\mathrm{m}$

In the given figure, all the adjacent sides are at right angles. Find the perimeter of the figure

In the given figure, all the adjacent sides are at right angles. Find the area of the figure

In the given figure, find the area of the shaded region

What will happen to the area of a rectangle, if its

(i) Length and Breadth are tripled?

What will happen to the area of rectangle, if its

(ii) length is doubled and breadth is halved?

By splitting the following figure into rectangles, find the area in ${\text{cm}}^2.$