It is called a diagonal and goes from any vertex to the next-but-one vertex.
Yes.
No, but the diagonals of a square does bisects its interior angles.
Rectangular prism: 8 Rectangular pyramid: 5
A rectangle is not a square but a square is a rectangle. That's because all that is required of a rectangle is the four vertex angles be 90 deg. A square not only requires the 90 deg angles but also its sides are all equal.
vertex
A rectangle minus a smaller rectangle which share a vertex.
It is called a diagonal and goes from any vertex to the next-but-one vertex.
A rectangle is a parallelogram in which all four vertex angles equal 90°.
Any one of its four corners.
8. (Its the corners)
A right angle triangle
Yes.
4
if you did not know the answer would be a pentagon.
rectangle means same size and shape
You don't. A rectangle doesn't have a hypoteneuse, only a right-angled triangle has a hypoteneuse. As for the diagonal of a rectangle, you can draw it from any vertex to the opposite vertex. It's length is the square root of the sum of the squares of the longer and the shorter side-lengths.