0
Infinitely many.
Let B be any number less than 6 cm, and let L = 12-B cm.
Then the perimeter of the rectangle, with length L and breadth B, is
2*[L+B] = 2*[(12-B)+B] = 2*12 = 24 cm.
There are infinitely many possible values for B, between 0 and 6 and so there are infinitely many possible rectangles.
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What is the perimeter of a square if its area is 36sqcm?
The perimeter is 24cm
What are three rectangles with the length and width of 24cm?
The answer is 576cm.
What would the ratio of a two rectangles be if one rectangles width is 24Cm and length 30Cm the other rectangle is width of 36 Cm length of 42 Cm?
These are not similar rectangles so there is no obvious candidate for the ratio. Is it ratio of lengths (sides, perimeter, diameter), or ratio of area?
What is the perimeter of a square if it has a area of 36 centimetre square?
24cm is the perimeter.
How many rectangles have a perimeter of 36 cm?
There is an infinite number that can have that perimeter
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