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Reasons for angles:

  • All angles on a straight line add up to 180 degrees.
  • Angles around a point add up to 360 degrees.
  • Opposite angles are equal.
  • Corrosponding angles are equal.
  • Alternate angles are equal.
  • Angles in a triangle add up to 180 degrees.
  • Angles in a quadrilateral add up to 360 degrees.
  • Base angles of an isosceles triangle are equal.

formulae for polygon- (n = number of sides of the shape)

sum of interior angles= 180 x (n-2)

sum of exterior angles = 360 degrees.

In a regular polygon all the sides are equal and all the angles are…


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