Question

Whats's the length of each side of the square if the perimeter of the square is 12 cm?

• A. $1cm$
• B. $2cm$
• C. $3cm$
• D. $4cm$

Answer 1

The correct option is C $3cm$

We know that,
square has all sides of equal length.

Now, let's consider length of side of square be $l$ cm.


Perimeter of square = length of side AB + length of side BC + length of side CD+ length of side DA
=$l+l+l+l$
=$4l$

Now, as given, perimeter of square is 12 cm.
$\therefore$ $4l$ = $12cm$

Using $trialanderrormethod$,

Putting $l$ = $1cm$ in the LHS of the generated equation,

we get $4\times 1cm$ = $4cm$.

Hence, LHS is not equal to RHS.

Putting $l$ = $2cm$ in the LHS of the generated equation,
we get $4\times 2cm$ = $8cm$.

Hence, LHS is not equal to RHS.

Putting $l$ = $3cm$ in the LHS of the generated equation,

we get $4\times 3cm$ = $12cm$

Hence, LHS = RHS.

$\therefore$ Length of each side of square is $3cm$.