Question

A square mirror of side 30 cm has to be framed. What is the length
of the frame needed? Give the answer in metres and centimetres.
(HINT: All sides of a square are equal.)​

Answer 1

Answer:

120 cm or 1.2 m

Step-by-step explanation:

Length of frame = Perimeter of the square

Perimeter of square

$= (4 \times 30) \: cm \\ = 120 \: cm$

Or

$120 \: cm \: = ( \frac{120}{100}) \: m \\ = 1.2m$

Answer 2

Given :

• A square mirror of side 30 cm has to be framed.

Find :

• What is the length of the frame needed?

Solution :

For the length of the frame :-

Perimeter of the square with side 30 cm is equal to the length of the frame.

We know that,

$\boxed{\sf{Perimeter = 4 \times Side}}$

Then,

Side given as 30 cm

$:\implies\sf{P = 4 \times 30}$

$:\implies\sf{P = 120}$

Hence, The length of the frame is 120 cm

120 cm

Converting into metres

$\because{1m = 100 cm}$

120 cm into m :

$:\implies\sf{ \dfrac{1}{100} \times 120}$

$\boxed{\therefore \sf{1.2m}}$

Thus, 1.2 m or 120 cm is the length.