A square has exactly 4 sides all the same length
A rectangle has 4 sides but 2 one length 2 another 2 longer 2 shorter:)))
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The main difference between a rectangle and a parallelogram that makes rectangle a special case of the parallelogram is the fact that all the angles of a rectangle are equal to 90 degrees. This is not the case in a parallelogram because the adjacent angles are only supplementary to each other.
main db using mcb sub main db using mccb that is deference
The main difference - is the centre of the galaxy. The heliocentric theory placed the Sun at the centre of our galaxy - the previous 'geocentric' theory placed the Earth at the centre.
Given that a year contains at most 366 days, I suggest that the main difference is that the first is impossible!
As far as I know it's an expression because it doesn't have an equal sign. That's the main difference between expressions and equations.