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(a) 100 cm and 144 cm

(b) 70 cm and 36 cm

Answer :

(a) Area of rectangle = 100 × 144

= 14400 cm

Area of one tile = 5 × 12

\(= 60 cm^2 \)

Number of tiles = \(\frac{(Area of rectangle)}{(Area of one tile)} \)

\(= \frac{14400}{60} \) = 240

Hence, 240 tiles are needed

(b) Area of rectangle = 70 × 36

\(= 2520 cm^2 \)

Area of one tile = 5 × 12

\(= 60 cm^2 \)

Number of tiles = \(\frac{(Area of rectangle)}{(Area of one tile)} \)

=\(\frac{2520}{60} = 42 \)

- Q.1 Find the area of the rectangles whose sides are: (a) 3 cm and 4 cm (b) 12 m and 21 m (c) 2 km and 3 km (d) 2 m and 70 cm
- Q.2 Find the areas of the squares whose sides are: (a) 10 cm (b) 14 cm (c) 5 m
- Q.3 The length and breadth of three rectangles are as given below: (a) 9 m and 6 m (b) 17 m and 3 m (c) 4 m and 14 m Which one has the largest area and which one has the smallest?
- Q.4 The area of a rectangular garden 50 m long is 300 sq m. Find the width of the garden.
- Q.5 What is the cost of tiling a rectangular plot of land 500 m long and 200 m wide at the rate of Rs 8 per hundred sq m.?
- Q.6 A table top measures 2 m by 1 m 50 cm. What is its area in square metres?
- Q.7 A room is 4 m long and 3 m 50 cm wide. Howe many square metres of carpet is needed to cover the floor of the room?
- Q.8 A floor is 5 m long and 4 m wide. A square carpet of sides 3 m is laid on the floor. Find the area of the floor that is not carpeted.
- Q.9 Five square flower beds each of sides 1 m are dug on a piece of land 5 m long and 4 m wide. What is the area of the remaining part of the land?
- Q.10 By splitting the following figures into rectangles, find their areas (The measures are given in centimetres).
- Q.11 Split the following shapes into rectangles and find their areas. (The measures are given in centimetres)

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