Find the perimeter of the following rectangle whose dimensions are given in centimeters.

A rectangle has a perimeter of $490 \mathrm{cm}$ and its length is two and a half times as long as its width. Find the width of the rectangle.(in $\mathrm{cm}$).

A picture frame measuring $30 \mathrm{cm}$ by $21 \mathrm{cm}$ has a picture placed in its centre, leaving a uniform border of $2 \mathrm{cm}$ around it. Find the perimeter of the picture.

A carpenter wants to fix a steel frame on the four sides of the top of a table. If the length and breadth of the table are $2 \mathrm{m}$ and $1.5 \mathrm{m}$, respectively, find the length of the steel frame required. Also find the cost of steel frame at $₹780 \mathrm{per} \mathrm{metre}$.

Which costs more - fencing a square field of side $25 \mathrm{m}$, or fencing a rectangular field of dimensions $15 \mathrm{m}$ by $12 \mathrm{m}$? The cost of fencing is $₹20$ per meter.

A lawn is in the shape of a square of side $5.8 \mathrm{m}$. Find its area. (in $\mathrm{square} \mathrm{units}$).

Find the area of the rectangles whose sides are as follows: (in $\mathrm{sq} \mathrm{units}$)

$17 \mathrm{cm} \mathrm{and} 12 \mathrm{cm}$ 

Find the area of the rectangles whose dimensions are as follows: (in ${\mathrm{m}}^2$)

$0.8 \mathrm{m} \mathrm{and} 60 \mathrm{cm}$ 

Find the area of the rectangles whose sides are as follows: (in $\mathrm{sq} \mathrm{units}$)

$21 \mathrm{cm} \mathrm{and} 16 \mathrm{cm}$