NCERT Exemplar Solutions
Class 6 - Mathematics - Unit 6: Mensuration - Problems and Solutions
Question 54

Question. 54

Wire bent into small squares of side 2 cm. Total area = 28 cm². Find original length of wire.

Answer:

28 cm

Detailed Answer with Explanation:

Step 1: Area of one small square

Side = \(2\,\text{cm}\)

Area of one square = \(\text{side} \times \text{side}\)

= \(2\,\text{cm} \times 2\,\text{cm} = 4\,\text{cm}^2\)

Step 2: Find how many such squares there are

Total area of all squares = \(28\,\text{cm}^2\)

Number of squares = \(\dfrac{\text{total area}}{\text{area of one}}\)

= \(\dfrac{28}{4} = 7\) squares

Step 3: Perimeter (boundary) of one small square

Perimeter of a square = \(4 \times \text{side}\)

= \(4 \times 2\,\text{cm} = 8\,\text{cm}\)

Step 4: Total length of the wire

The wire makes all the boundaries, so

Total length = \(\text{number of squares} \times \text{perimeter of one}\)

= \(7 \times 8\,\text{cm} = 56\,\text{cm}\)

Answer: \(\boxed{56\,\text{cm}}\)

NCERT Exemplar Solutions Class 6 – Mathematics – Unit 6: Mensuration – Problems and Solutions | Detailed Answers