How many having plane of symmetry?

Which of the following compounds have the plane of symmetry?

A molecule having a plane of symmetry is a chiral molecule.

How many lines of symmetry does a scalene triangle have ?

An angle having equal arms possesses how many lines of symmetry ? Show all possible lines of symmetry in such an angle.

How many lines of symmetry does the following have : a. Rectangle b. Line segment c. Square d. Isosceles triangle. e. Regular octagon.