A square is very much a rectangle – the definition of a rectangle is simply “all angles are right angles” which is certainly satisfied by a square. We should subtract only if specifically asked to do so. In a similar manner, a rectangle is a parallellogram (and so is a rhombus)

We should subtract number of squares from 1296 or we are taking advantage of the fact that square is a special type of rectangle?

A square is very much a rectangle – the definition of a rectangle is simply “all angles are right angles” which is certainly satisfied by a square. We should subtract only if specifically asked to do so. In a similar manner, a rectangle is a parallellogram (and so is a rhombus)

regards

J

Hello J,

In case of the rectangle why are we taking 9C2 ? Could you please explain as i am unable to get ðŸ˜¦

Choosing any 2 out of the 9 horizontal lines which demarcate the rows, and any 2 out of the 9 vertical lines which demarcate the columns.

regards

J

Thanks J