The number zero has rotational symmetry.
A zero technically has an infinite amount of lines of symmetry.
A parallelagram can be a square, which has four lines of symmetry or a rectangle which has two lines of symmetry but the generic parallelagram has zero lines of symmetry
Zero
Usually none. But one in an isosceles trapezium.
Zero
It can have anywhere from zero to four of them.
ZERO!
Symmetry affects the dipole moment of a molecule by determining whether the individual dipole moments of its bonds cancel out or add up. A molecule with overall symmetry may have a zero dipole moment due to opposing dipoles, while asymmetric molecules will have a non-zero dipole moment. Symmetry can influence the overall polarity and reactivity of the molecule.
For a right isosceles triangle (45-45-90), there is one line of symmetry that bisects the hypotenuse. For all other right triangles, there are zero lines of symmetry.
There are different kinds of triangles, some are symmetrical and some aren't.
zero, all the keys have different letters, numbers, or symbols
A capital N has no lines of symmetry (nor semetry).