Infinitely many.
Four sided quadrilaterals have two diagonals.
5
Quadrilaterals do have hypotenuses, but they aren't drawn in. They go through the middle of the quadrilateral diagonally.
Yes. The side lengths for angle measures don't count.
A trapezoid can be drawn with one right angle.
In first angle auto graphic projection the planed, view is drawn exactly below the front elevation. What is viewed from the left is drawn from the right side of the front, it is drawn in the 1st angle and 3rd angle.
45o
Cross-hatch lines used in Architectural drawings are normally drawn at a 45 degree angle.
This depends if it is an animated movie, which has been been drawn and animated on a computer, then yes.But if it has been drawn as 2D as a flat image, from a downwards angle, then no.If it has been drawn from an angle then it is slightly possible.
The square drawn in a right angle simply is to indicate that the angle is, indeed, 90 degrees.
60
Basically its just where you position the views of the main object, in first angle projection, if you view the object from the left, the view is drawn to the right of the object, in third angle projection, its drawn on the viewing side.