Question

D. Perimerel = 30 LITI, B = 4 cm.
m
811) Find the perimeter of a rectangle with
length of 8 cm and a breadth of 5 cm
12 The perimeter of a rectangular card is
28 cm. If the length of the card is 8 cm
then, find its breadth.
13 The length of a rectangle is 45 m and its
perimeter is 150 m. What is its breadth?
HOTS 14 Seema used 10 m of braid to put a border
around the edges of a bedcover. If the
width of the bedcover is 2 m, what is its
length​

Answer 1

'l' is the length and 'b' is the breadth/width.

Step-by-step explanation:

D. Perimeter = 30cm = 2×(l+b)

= 2l + 2b = 2l + 2×4 = 2l + 8

2l = 30 - 8 = 22

=> l = 22/2 = 11cm

11) perimeter of a rectangle = 2×(l+b) = 2×(8+5) = 26cm

12. perimeter of the rectangle = 28cm = 2×(l+b)

= 2l + 2b = 2×8 + 2b = 16 +2b

2b = 28 - 16 = 12

=> b = 12/2 = 6cm

13. perimeter of the rectangle = 150m = 2×(l+b)

= 2l + 2b = 2×45 + 2b = 90 + 2b

2b = 150 - 90 = 60

=> b = 60/2 = 30m

14. length of braid used = perimeter of the rectangle = 10m = 2×(l+b)

= = 2l + 2b = 2l + 2×2 = 2l + 4

= 2l = 10 - 4 = 6

=> l = 6/2 = 3m

Hope this will help you.

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