A rectangle has 4 right angles.
A rectangle has 4 equal right angles of 90 degrees.
A rectangle has 4 interior 90 degree angles
The same for both. Both a square and a rectangle have 4 equal angles.
A rectangle has 4 equal right angles of 90 degrees.
There are no acute angles in a rectangle which has 4 equal interior right angles
4 angles and 4 equal sides
All four angles of a rectangle must equal 90 degrees each.
In a regular nonagon there are 9, if its irregular its dependant.
Whether it is a regular or irregular octagon does not matter. An octagon is, by definition, a 2-dimensional figure with eight sides, and therefore with eight angles. A regular octagon will have eight equal angles and an irregular octagon will have eight angles some of which are not equal to the others.
A heptagon has seven sides. In a regular heptagon all of the sides and angles are equal. In an irregular heptagon the sides and angles are not all equal.
maybe none, certainly less than 6