Advertisements
Advertisements
प्रश्न
How many different rectangles can be made with a 48 cm long string? Find the possible pairs of length and breadth of the rectangles.
Advertisements
उत्तर
Length of the string to be made into rectangle = 48 cm
∴ Perimeter of the rectangle = 48 cm
2 × (l + b) = 48 cm
l + b = `48/2`
l + b = 24 cm
Possible pairs of length and breadth are (1, 23), (2, 22) (3, 21), (4, 20), (5, 19), (6, 18), (7, 17), (8, 16), (9, 15), (10, 14), (11, 13), (12, 12)
Number of different rectangles = 12
APPEARS IN
संबंधित प्रश्न
Find the length and perimeter of a rectangle, whose area = 120 cm2 and breadth = 8 cm
Each side of a square field is 70 cm. How much distance will a boy walk in order to make?
(i) one complete round of this field?
(ii) 8 complete rounds of this field?
A school playground is rectangular in shape with length = 120 m and breadth = 90 m. Some school boys run along the boundary of the play-ground and make 15 complete rounds in 45 minutes. How much distance they run during this period.
Find the perimeter of a regular pentagon of side 8.2 cm.
A farmer has a rectangular field of length and breadth 240 m and 180 m respectively. He wants to fence it with 3 rounds of rope as shown in the figure. What is the total length of rope he must use?
If we take 4 rounds around a field that is 160 m long and 90 m wide, what is the distance we walk in kilometers?
If every side of a rectangle is doubled, then its area becomes _______ times
Rahim and Peter go for a morning walk, Rahim walks around a square path of side 50 m and Peter walks around a rectangular path with length 40 m and breadth 30 m. If both of them walk 2 rounds each, who covers more distance and by how much?
What is the perimeter of the following figures? What do you infer from the answers?
 (a) |
 (c) |
 (b) |
 (d) |
What is the correct formula for the perimeter of a rectangle with length (l) and breadth (b)?
