Question

m, 18.5
3. (a) Find the perimeter of the square whose sides are:
(ii) 50 cm
(i) 18 cm
(iii) 23 cm
(iv) 18.5cm​

Answer 1

Step-by-step explanation:

3)a)-Perimeter of a square=4×Side

i)50 cm=4×50=200 cm

ii) 18 cm=4×18=72 cm

iii) 23 cm=4×23=92 cm

iv) 18.5 cm=4×18.5=74 cm.

Answer 2

Answer :

›»› (i) The perimeter of the square is 72 cm.

›»› (ii) The perimeter of the square is 200 cm.

›»› (iii) The perimeter of the square is 92 cm.

›» (iv) The perimeter of the square is 74 cm.

Step-by-step explanation :

Given :

• (i) Side of square = 18 cm.
• (ii) Side of square = 50 cm.
• (iii) Side of square = 23 cm.
• (iv) Side of square = 18.5 cm.

To Find :

• The perimeter of the square.

Formula required :

Formula to calculate the perimeter of square is given by,

→ Perimeter of square = 4a.

Here,

• a is the side of a square.

Units,

• The unit of perimeter of square is centimetre (cm).
• The unit of side is centimetre (cm).

Solution :

(i) The side of a square is 18 cm.

We know that, if we are given with the side of square then we have the required formula, that is,

→ Perimeter of square = 4a.

By using the formula to calculate the perimeter of square and substituting the given values in the formula, we get :

→ Perimeter of square = 4 × 18

→ Perimeter of square = 72.

Hence, the perimeter of square is 72 cm.

(ii) The side of square is 50 cm.

We know that, if we are given with the side of square then w e have the required formula, that is,

→ Perimeter of square = 4a.

By using the formula to calculate the perimeter of square and substituting the given values in the formula, we get :

→ Perimeter of square = 4 × 50

→ Perimeter of square = 200.

Hence, the perimeter of square is 200 cm.

(iii) The side of square is 23 cm.

We know that, if we are given with the side of square then we have the required formula, that is,

→ Perimeter of square = 4a.

By using the formula to calculate the perimeter of square and substituting the given values in the formula, we get :

→ Perimeter of square = 4 × 23

→ Perimeter of square = 92.

Hence, the perimeter of square is 200 cm.

(iv) The side of square is 18.5 cm.

We know that, if we are given with the side of square then we have the required formula, that is,

→ Perimeter of square = 4a.

By using the formula to calculate the perimeter of square and substituting the given values in the formula, we get :

→ Perimeter of square = 4 × 18.5

→ Perimeter of square = 74.

Hence, the perimeter of square is 74 cm.