if the length and breadth of a rectangle are doubled.how many times the perimeter of the old rectangle be?
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Let the length and breadth be l and b respectively
...
After doubling it will be 2l and 2b
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Perimeter = 2( L + b)
... = 2 ( 2L + 2B)
= 2 X 2 ( L + B). Taking 2 out
= 4 (L + B) = answer
Therefore, the perimeter will be doubled
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