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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.
PROPERTIES OF TRIANGLES AND QUADRILATERALS. Types of triangles. Triangles can be classified in various ways, based either on their symmetry or their angle properties. An equilateral triangle has all three sides equal in length, and all three angles equal to 60Â°. An isosceles triangle has two sides equal, and the two angles opposite the equal sides also the same. Thus in the diagram, angle A = angle C. A scalene triangle has all three sides and angles different. All triangles have an interior angle sum of 180Â°.