The length of a rectangle is 4 cm more than its width. If the perimeter of the rectangle is 40 cm, what is its length?

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ഒരു ചതുരത്തിന്റെ നീളം വീതിയേക്കാൾ 4 സെ.മി കൂടുതലാണ്. ചതുരത്തിന്റെ ചുറ്റളവ് 40 സെ.മി ആയാൽ അതിന്റെ നീളം എത്ര?

A10

B12

C20

Answer:

വീതി = A നീളം = A + 4 ചുറ്റളവ് = 2[നീളം + വീതി] = 40 = 2[A + 4 + A] 2[2A + 4] = 40 2A + 4 = 20 2A = 16 A = 8 നീളം = A + 4 = 8 + 4 = 12

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