Its angles are determined at its vertices which is the plural of vertex
The angles
4
The answer depends on the context. Angles are related in many ways: parallel lines, angles at a point, angles in a polygon - all impose constraints on angles from which their measure may be determined.
Cubes and Cuboids, some pyramids I think (not sure) Prisms. Most shapes can except for spheres ; p
They are equal corresponding angles.
The angles
4
no... they do not have right angles connected to the sides
They used it to make correct angles in the pyramids.
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.
can't be determined
Can't be determined
There are no right angles in a square based pyramid, so Pythagoras and his theorem are not involved.
The Bent Pyramids' angles were calculated incorrectly and would be too heavy for its' height. By the time this was realized, they changed the angles at the top to make the sides meet.
The answer depends on the context. Angles are related in many ways: parallel lines, angles at a point, angles in a polygon - all impose constraints on angles from which their measure may be determined.
Cubes and Cuboids, some pyramids I think (not sure) Prisms. Most shapes can except for spheres ; p
Any and every triangle has three sides and three angles; that is the defintion. The type of triangle cannot be determined without more information.