Question

How many lines of symmetry does an equilateral triangle have?

4
3
2
6

Answer 1

3

Answer 2

The number of lines of symmetry for a regular polygon of n vertices has n lines of symmetry.

Thos of odd degrees have lines of symmetry through each vertex and the mid-point of the opposite side.

Polygons with even number of vertices, have lines of symmetry through each vertex and the opposite vertex, as well as lines joining the mid-points of pairs of opposite sides.

Answer 3

It's not that deep.
A scalene triangle is a triangle with no lines of symmetry
an isosceles triangle has at least one line of symmetry and an equilateral triangle has three lines of symmetry.

Answer 4

@Shay17 Sure about the isosceles one?

Answer 5

@Isaiah.Feynman
"at least one" because isosceles triangles could also be equilateral, just like rectangles could be squares.

Answer 6

Thanks @mathmate

Answer 7

You're welcome!