5
Six triangles.
A star is not a specific shape: it is a generic word for a shape which has an even number of vertices. The interior angles at alternate vertices are usually reflex angles. A star can have six or more vertices.
A geometrical star can have various numbers of vertices, and the angles formed at the vertices need not be the same. The number of perpendicular lines depends on exactly how many vertices it has and how their angles are configured.
None. Most stars are roughly spherical globes of gas.
A 4 pointed star.
A four pointed star.
5
A regular star with n points has 2 interior angles of which n are acute and n are reflex.
20
Take a star for example, the points are acute angles, so, there would be five. * * * * * Taking a star, for example, does not give the maximum because the maximum is likely to appear in an unusual shape. It should be possible to have a decagon with 7 acute angles and 3 reflex angles.
A four edged star.
It is a concave octagon.
10 angles
10 angles
A 5 pointed star has 10 sides.
10 sides and 10 angles