The perimeter of the rectangle is 40cm. Could one of its sides be 21 cm long?
| December 5, 2020 | education
in a rectangle opposite sides are equal, therefore P = 2 (a + b)
so 40 = 2 (a + b)
20 = a + b
if one side is 21, then the second must be -1, this cannot be, then
Answer: NO
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