Question

42cm long wire is to be bent to form a rectangle. length of the diagonal of a rectangle is 15cm.find the length and breadth of rectangle?​

Answer 1

Answer:

length = 12. breadth = 9

Step-by-step explanation:

length + breadth =

l + b = 42/3

= 21

l² + b² = 15² = 225

( l + b )² = l² + b² + 2lb

21² = 225 + 2lb

2lb = 441-225 = 216

( l - b)² = l² + b² - 2lb

= 225 - 216

= 9

l - b = 3

l + b = 21

Adding these, we get

2l = 24

l = 12

b = 21 - 12

= 9

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