No, scalene triangles, which have sides of different lengths, have none. Isosceles triangles, with only two sides the same, only have one.
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A scalene triangle. Though it's usually defined as having three sides of different lengths, this is an equivalent definition: all equilateral triangles have three lines of symmetry, and all isosceles triangles have one (no triangle has two lines of symmetry).
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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.
If your asking what shape has three lines of symmetry, your answer would be an equilateral triangle. You can tell how many lines of symmetry a shape that has all angles of the same measure has by looking at it's angles. Ex., pentagon has five angles--five lines of symmetry; octagon has eight angles, eight lines of symmetry; etc.
Of the the seven letters, ABCDEFG, F and G have no lines of symmetry. However,Êall of them could have lines of symmetry if theyÊwere presented in three dimensions.