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Any polygonal shape, other than a triangle can have perpendicular lines.
a triangle * * * * * Wrong on at least two counts: A triangle need not be irregular and a triangle is not a three dimensional shape. Any pyramid other than a regular triangular pyramid (tetrahedron), any prism other than a cube are some examples.
Any geometric shape that has more than three sides.
Any shape, other than a triangle can have a pair of perpendicular sides.
equilateral triangle