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(a) 3 cm and 4 cm

(b) 12 m and 21 m

(c) 2 km and 3 km

(d) 2 m and 70 cm

Answer :

Area of rectangle = Length × Breadth

(a) l = 3 cm and b = 4 cm

Area = l × b = 3 × 4 = 12 \( cm^2 \)

(b) l = 12 m and b = 21 m

Area = l × b = 12 × 21

= 252 \( m^2 \)

(c) l = 2 km and b = 3 km

Area = l × b = 2 × 3

= 6 \( km^2 \)

(d) l = 2 m and b = 70 cm = 0.70 m

Area = l × b = 2 × 0.70

= 1.40 \( m^2 \)

- 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)
- Q.12 How many tiles whose length and breadth are 12 cm and 5 cm, respectively will be needed to fit in a rectangular region whose length and breadth are respectively? (a) 100 cm and 144 cm (b) 70 cm and 36 cm

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