no. all angles would be acute
Right angles are used in architecture. All buildings are essentially based off of right angles (from the ground to a wall).
If a triangular based pyramid has any right angles it has three. (Think of the corner of a cube). There are many triangular based pyramids that do not have any right angles.
4
Normally four but there could be six if the opposite edges at the apex met at right angles.
No angles are larger than 90 degrees in a square based pyramid.
Yes its base contains 4 corner right angles
Yes - it has four around the base !
4
Not normally if it's a regular based pentagonal pyramid.
Acute, right angle, obtuse and reflex.
... right angles, by definition of a rectangle.... right angles, by definition of a rectangle.... right angles, by definition of a rectangle.... right angles, by definition of a rectangle.
There are no right angles in a square based pyramid, so Pythagoras and his theorem are not involved.