Polygon

• What is a polygon?

  A polygon is a closed figure formed by line segments intersecting at endpoints.
• What are the segments of a polygon called?

  The segments of a polygon are called sides.
• How are polygons classified?

  • By the number of sides:
  • Triangles (3 sides)
  • Quadrilaterals (4 sides)
  • Pentagons (5 sides)
  • Hexagons (6 sides)
  • Heptagons (7 sides)
  • Octagons (8 sides)
  • Nonagons (9 sides)
  • Decagons (10 sides)
• What is a triangle?

  A triangle is a three-sided polygon.
• What are the three kinds of triangles?

  1. Equilateral: All three sides are equal.
  2. Isosceles: Two sides are equal.
  3. Scalene: All three sides are of unequal length.
  4. Right: One of the angles is a right angle.
• What is a quadrilateral?

  A quadrilateral is a four-sided polygon.
• What are the types of quadrilaterals?

  • Parallelogram: Two pairs of opposite sides are parallel and equal.
  • Rectangle: A parallelogram with a right angle.
  • Square: A rectangle with four equal sides.
  • Rhombus: A parallelogram with equal sides.
  • Trapezoid: A quadrilateral with one pair of parallel sides.
  • Trapezium: A quadrilateral with no parallel sides.
• What is a parallelogram?

  A parallelogram is a quadrilateral with two pairs of opposite sides parallel and equal.
• What is a rectangle?

  A rectangle is a parallelogram with a right angle.
• What is a square?

  A square is a rectangle with four equal sides.
• What is a rhombus?


  A rhombus is a parallelogram with equal sides.
• What is a trapezoid?


  A trapezoid is a quadrilateral with one pair of parallel sides.
• What is a trapezium?


  A trapezium is a quadrilateral with no parallel sides and no equal angles.
• What is a pentagon?

  A pentagon is a five-sided polygon.
• What is a regular pentagon?

  A regular pentagon has all sides and angles equal, with each angle measuring $120^\circ$.
• What is a hexagon?

  A hexagon is a polygon with six sides.
• What is a regular hexagon?

  A regular hexagon has all sides and angles equal, with each angle measuring $120^\circ$.
• What is a heptagon?

  A heptagon is a polygon with seven sides.
• What is a regular heptagon?

  A regular heptagon has all sides and angles equal, with each angle approximately equal to $128.56^\circ$.
• What is an octagon?


  An octagon is a polygon with eight sides.
• What is a regular octagon?

  A regular octagon has all sides equal, with each angle measuring $135^\circ$.
• What is a nonagon?


  A nonagon is a polygon with nine sides.
• What is a regular nonagon?

  A regular nonagon has all sides and angles equal, with each angle measuring $140^\circ$.
• What is a decagon?


  A decagon is a polygon with ten sides.
• What is a regular decagon?

  A regular decagon has all sides and angles equal, with each angle measuring $144^\circ$.