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प्रश्न
The length of a rectangle is twice of its breadth. If its perimeter is 60 cm, find its length.
उत्तर
Let the breadth of the field = x cm
∴ its length = 2x
and, its perimeter = 2 x (length + breadth)
= 2 x (2x + x)
= 2(3x)
= 6x cm
Perimeter = 60 cm
⇒ 60 cm = 6x cm
⇒ x =`60/6` = 10 cm
∴ Breadth = x = 10 cm
Length = 2x = 2 x 10 = 20 cm
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