A rectangle has 2 axes of symmetry.
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a rectangle has 2 axes of symmetry
only when the rectangle is a square
Yes. In 3 dimensions, a rectangle has 3 C2 axes perpendicular to each other and an inversion center at the center of the rectangle. There are also reflection planes along each of the C2 axes; this makes the point group of the rectangle D2h.
It has 5 axes of symmetry
An isosceles triangle definitely has three axes of symmetry