Polygons

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Polygons

• Exploring

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What is a polygon?

• Polygons are many-sided figures, with sides that
  are line segments. Polygons are named according
  to the number of sides and angles they have.
• Can be regular all sides and all angles are
  equal to each other

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Isosceles Triangles

• Two sides of equal length
• Three acute angles
• Sum of angles 180

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Equilateral Triangles

• All sides equal length
• Three acute angles
• Sum of angles 180
• Is a regular polygon

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Scalene Triangles

• No sides are equal
• No angles are equal
• May have obtuse angle
• Sum of angles 180

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Rectangles

• Opposite sides are parallel
• Opposite side are equal in length
• Each angle equals 90
• Sum of angles 360

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Squares

• All sides equal
• All angles equal and are 90 each
• Sum of angles 360
• Is a regular polygon

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Trapezoids

• Two sides are parallel
• Has obtuse and acute angles
• Sometimes has a right angle
• Sum of angles 360

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Rhombuses (rhombi)

• All four sides of equal length
• Opposite angles are equal 2 acute angles, 2
  obtuse angles
• Sum of angles 360
• Regular polygon

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Parallelograms

• Opposite sides parallel
• Opposite sides equal in length
• Opposite angles equal
• Sum of angles 360

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Pentagons

• 5 sides
• Sum of angles 540
• Regular polygon

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Hexagons

• 6 sides
• Sum of angles 720
• Can be regular polygon

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Octagons

• 8 sides
• Sum of angles 1080
• Can be regular polygon

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Decagons

• 10 sides
• Sum of angles 1440
• Can be regular polygon