Equilateral triangle, Has 3 equal sides, Has 3 equal angles (60° each), Isosceles triangle, Has 2 equal sides and 1 different side. The angles opposite the equal sides are also equal., Scalene triangle, Has all sides different, All angles are different too, Acute triangle, Has 3 acute angles (less than 90°), Right triangle, Has 1 right angle (exactly 90°). The other two angles are acute, Obtuse triangle, Has 1 obtuse angle (greater than 90°). The other two angles are acute, Square, 4 equal sides, 2 pairs of parallel sides, 4 right angles (90°), Rectangle, Opposite sides are equal, 2 pairs of parallel sides, 4 right angles (90°), Rhombus, 4 equal sides, 2 pairs of parallel sides, sides are not perpendicular, Parallelogram, Opposite sides are equal, 2 pairs of parallel sides, No right angles → sides are not perpendicular, Trapezoid, Exactly 1 pair of parallel sides and no pairs of perpendicular sides., Pentagon, All angles are equal, no parallel sides, no perpendicular lines (no 90° angles), has more than 4 sides.

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