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Maybe. Maybe not. Lots of polygons will have no parallel or perpendicular sides, but some will have some. As we mentioned before, right triangles have perpendicular sides, rectangles have both perpendicular and parallel sides, but other quadrilaterals might not. A regular pentagon has no parallel or perpendicular sides, but a non-regular pentagon might have parallel and perpendicular sides.
Triangles are just shapes with 3 (straight) sides. They can be big or small and can look somewhat different. Depending on the angles and the sides we can sort the triangles into different types. The simplest way to sort triangles is by their angle size: 1  Acute triangle: An acute triangle is one in which all the angles are acute (less than 90Â°). 2  Obtuse triangle: An obtuse triangle is one in which one of the angles is obtuse (more than 90Â°).