In a right pyramid the apex is directly above the centroid of the base - whatever shape that is. One consequence is each of the faces, other than the base, are isosceles (or equilateral) triangles.
The answer will depend on the area of the base, whether or not it is a right pyramid, and its height.
It does not have to have any. If it is a right pyramid, it will have 2 pairs.
The longer of the sides forming the rectangular base of the pyramid.
No but a right angle triangle does
A trapezium or a triangle. If the pyramid is a right pyramid then they would both be isosceles.
You got it right, "pyramid!"
There are no right angles (90 degrees) in a hexagonal pyramid.
A pyramid could have any number of right angles between, and inlcuding, none and 8.
No but a right angle triangle does
The answer will depend on the area of the base, whether or not it is a right pyramid, and its height.
It does not have to have any. If it is a right pyramid, it will have 2 pairs.
A regular pyramid is a right pyramid whose base is a regular polygon. There are only three regular pyramids: a regular tetrahedron, a regular square pyramid, and a regular pentagonal pyramid.
The longer of the sides forming the rectangular base of the pyramid.
No but a right angle triangle does
A trapezium or a triangle. If the pyramid is a right pyramid then they would both be isosceles.
If it is a right pyramid then four, otherwise one or none.
A pyramid has 6 angles, 8 faces, and 6 edges. Is that right?