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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.
In triangle ABC below, all sides are 12 feet making triangle ABC equilateral. Classification of Triangles. Triangles may be classified by. (A) their sides. (B) their angles. A scalene triangle has 3 different sides. An isosceles triangle has two equal sides and one side that is not equal. An equilateral triangle has 3 equal sides. In an acute triangle, all of the angles will measure less than 90 degrees.