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An isosceles triangle has one line of symmetry. An isosceles triangle has no rotational symmetry. A triangle can have either one, two or three lines of symmetry. An triangle can have no lines of symmetry. An triangle can have rotational symmetry of order 2.
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A triangle can have either one, two or three lines of symmetry
Double the lengths of the triangle’s sides = double the size of the angles
2 4 6
6 2 4
a b c
10 17 x
x 17 10