No angles are larger than 90 degrees in a square based pyramid.
Yes - it has four around the base !
A triangle can never have three right angles
a right triangle has one right angle and two acute angles
In a right angled triangle the two other angles are acute.
No but a right angle triangle does
No angles are larger than 90 degrees in a square based pyramid.
Not normally if it's a regular based pentagonal pyramid.
Yes - it has four around the base !
4
Normally four but there could be six if the opposite edges at the apex met at right angles.
A triangle is a 2D shape, so as such it has no volume. (Since it is a length and a width, but has no depth). The equivalent of a triangle in 3D is a triangular based pyramid, which clearly does have a volume. You may have meant "area" rather than volume?
A triangle has no right angles when it is not a right angle triangle as for example as in the case of an equilateral triangle that has 3 equal 60 degree angles.
Yes its base contains 4 corner right angles
There are no obtuse angles in a right triangle. A right triangle consists of one right angle and two acute angles.
There are no right angles (90 degrees) in a hexagonal pyramid.
A triangle can never have three right angles