A capital N has no lines of symmetry (nor semetry).
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Capital letters that have parallel lines include "H," "I," and "E." These letters have horizontal lines that are parallel to each other. The letter "H" has two parallel horizontal lines, the letter "I" has one, and the letter "E" has three parallel lines.
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x= 5y+10 * * * * * That looks like a mistaken merge! A regular polygon with n sides has n lines of symmetry.
In general, a regular n-gon has n lines of symmetry (for odd n, each line goes through a vertex and the side opposite; for even n, half the lines go through two opposite vertices and half go through two opposite sides). A regular heptagon has 7 lines of symmetry. It has 7 symmetrical lines