EXERCISE

Find out which of the following has the largest perimeter.

(a) An equilateral triangle of side $20 \mathrm{cm}$.

(b) A square of side $10 \mathrm{cm}$.

(c) A regular pentagon of side $7 \mathrm{cm}$.

(d) A regular hexagon of side $5 \mathrm{cm}$.

The length of the ribbon used to stick on all the sides of a regular pentagon is $150 \mathrm{cm}$. Find the length of one side of the pentagon.

Two sides of a scalene triangle measure $15 \mathrm{cm}$ and $12 \mathrm{cm}$. If the perimeter of the triangle is $40 \mathrm{cm}$, find the length of the third side.

There are $3$ ribbons each of length $240 \mathrm{cm}$. They are used to stitch along sides of three banners as shown below.

Find the length of the side of each banner.

The length and the breadth of $4$ rectangles are given below. Find their perimeters. What do you infer from the answer?

$\left(\mathrm{a}\right)$ Length $=11 \mathrm{cm};$  Breadth $=4 \mathrm{cm}$

$\left(\mathrm{b}\right)$ Length $=8 \mathrm{cm};$ Breadth $=7 \mathrm{cm}$

$\left(\mathrm{c}\right)$ Length $=14 \mathrm{cm};$Breadth $=1 \mathrm{cm}$

$\left(\mathrm{d}\right)$ Length $=10 \mathrm{cm};$ Breadth $=5 \mathrm{cm}$

Surbhi wants to seal the lid of a rectangular box with tape. Find the length of the tape required, if the length and the breadth of the lid are $25 \mathrm{cm}$ and $12 \mathrm{cm}$ respectively.

A carpenter wants to fix a steel frame on the four sides of the top of a table. If the length and the breadth of the table are $2.5 \mathrm{m}$ and $1.75 \mathrm{m}$ respectively, find the length of the steel frame required.

Ammu wants to decorate a photo frame with a metal strip. If the length and the breadth of the photo frame are 55 cm and 42 cm respectively, find the length of the strip required.