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An unequal triangle is a closed plane figure bounded by three straight lines such that the length of at least one of the lines is different from that of another.
IF (and only if) the lines are al coplanar, then a polygon.
Three
A polygon is a shape made of three or more straight lines that surround a closed space. If you had three lines that did not make a triangle but instead looked like the letter "N," that would not be a polygon because the lines don't close a space. A space is closed when it is entirely surrounded by lines.Hope that helped :D
Oh, dude, that's an easy one. A triangle has three lines of symmetry. Yeah, like, you can fold that bad boy in half three different ways and it's still looking symmetrical. Triangles, man, they're like the cool kids of geometry.