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Geometric Shape Properties Shape Name of Shape Polygon (straight sided shapes) Quadrilaterals (4 sided shapes) Triangle Square Rectangle Rhombus Trapezoid Kite Parallelogram Geometric Properties - 3 sides 3 vertices straight line Equilateral (3 lines of symmetry) Not sets of parallel lines 4 equal sides 4 vertices 2 sets of parallel lines (sides) 4 right angles (90º angles) 4 lines of symmetry 2 sets of parallel lines 4 sides 4 vertices 2 sets of parallel lines (sides) 2 sets of sides of equal length 4 right angles (90º angles) 2 lines of symmetry 2 sets of parallel lines 4 equal sides 4 vertices 2 sets of parallel lines (sides) 2 obtuse angles (greater than 90º) 2 acute angles (less than 90º) 2 lines of symmetry 2 sets of parallel lines 4 sides 4 vertices 1 set of parallel sides 1 set of sides of equal length 2 obtuse angles (greater than 90º) 2 acute angles (less than 90º) 1 line of symmetry 1 set of parallel lines 4 sides 4 vertices 2 sets of sides of equal length NO parallel sides 1 line of symmetry no sets of parallel lines 4 sides 4 vertices 2 sets of parallel lines (sides) 2 sets of sides of equal length 2 obtuse angles (greater than 90º) 2 acute angles (less than 90º) no lines of symmetry 2 sets of parallel of lines - Circle Ellipse (oval) Pentagon Hexagon Heptagon Octagon Angles - 5 sides lengths 5 vertices 5 angles (right, acute, obtuse angles) 5 lines of symmetry 6 sides lengths 6 vertices 6 obtuse angles 6 lines of symmetry 3 sets of parallel lines 7 sides lengths 7 vertices 7 angles 7 lines of symmetry 8 sides lengths 8 vertices 8 obtuse angle 8 lines of symmetry (regular) where two line segments meet acute - less that 90° right - 90° obtuse – greater than 90° straight - 180° Irregular Geometric Shape vs. Regular Geometric Shape Concave (points in; cave) Convex (points out; vertex) one continuous curved side no vertices no straight lines no angles 360 lines of symmetry one continuous curved side no vertices no straight lines no angles 1 line of symmetry