Ex.14.3 Q4 Symmetry - NCERT Maths Class 7
Fill in the blanks – Shape; Centre of Rotation; Order of Rotation; Angle of Rotation; for each of the figures respectively.
Centre of Rotation
Order of Rotation
Angle of Rotation
What is known?
What is unknown?
Centre of rotation, order of rotation and angle of rotation.
Centre of rotation: In case of polygon centre of rotation is intersecting point of diagonals and in case of circle centre of rotation is centre of the circle.
Order of rotation: In case of regular polygon order of rotation is always equals to the number of sides and in case of circle order of rotation is infinite.
Angle of rotation: In case of regular polygon angle of rotation is always equals to the measurement of one angle and in case of circle angle of rotation is at every point.
|Centre of Rotation||Order of Rotation||Angle of Rotation|
|Square||Intersecting points of diagonals||\(4\)||\(90^\circ\)|
|Rectangle||Intersecting points of diagonals||\(2\)||\(180^\circ\)|
|Rhombus||Intersecting points of diagonals||\(2\)||\(180^\circ\)|
|Equilateral Triangle||Intersecting points of diagonals||\(3\)||\(120^\circ\)|
|Regular Hexagon||Intersecting points of diagonals||\(6\)||\(60^\circ\)|
|Circle||Mid- point of diameter||Infinite||At every point|
|Semi-circle||Mid- point of diameter||\(1\)||\(360^\circ\)|