The answer will depend on the figure, the type(s) of symmetry and what information about is is given.
yes
equilateral acute
A circle and square.
A geometric solid. The answer is NOT polyhedron. A cone, for example, which is a figure made up of the most simple geometric shapes (a straight line) and a circle, is not a polyhedron.
Line
A parallelogram does not have a line of symmetry.
A square
An axis of symmetry is any of one or more lines about which a geometric figure is symmetrical.
Shapes do not always have lines of symmetry. For example, if you have an irregular shape, it will not have a line of symmetry. I am quite certain though that all geometric shapes have a line of symmetry.
Only One Line of SymmetryAn isosceles triangle only has one line of symmetry.
The figure is a Regular polygon.
square
polygon
It is important so you can later prove that the figure is congruent using a geometric proof or other method. It is also useful for finding side lengths and the measures of angles.
Any two dimentional geometric figure has a measurable length. This measurement is called circumference. This is also called a plane figure. Examples of plane figures with measurable lengths are: triangle, square, circle, and rectangle.
All interior angle measures and side lengths of one figure must be the same for the other figure.
Any "regular" polygon.