Class 7 - Arjun

Ex 11.1

• linear symmetry
• axis of symmetry
• mirror line
• each regular polygon has as many as lines of symmetry as its sides

Ex 11.2

• rotational symmetry
• centre of rotation
• smallest angle to turn is known as angle of rotation
• number of times the shape will fit onto itself in one complete rotation is called order of rotational symmetry
• order = 360 / smallest angle of rotation
• no rotational symmetry
• figures with both symmetry
  • equilateral triangle
  • rectangle
  • rhombus
  • square
  • all regular polygons
• only linear symmetry
  • isosceles triangle
  • isosceles trapezium
  • kite
• only rotational symmetry
  • parallelogram