Question

Fill in the blanks.

Shape	Centre of Rotation	Order of Rotation	Angle of Rotation
Square
Rectangle
Rhombus
Equilateral Triangle
Regular triangle
Circle
Semicircle

Answer 1

Hint – Here we will proceed by using the concept of order of rotation, angle of rotation and centre of rotation. Then we can easily fill-up the blanks.

Complete step by step answer:

Centre of Rotation – The centre of rotation is a point about which a plane figures rotates. This point does not move during the rotation.
Order of Rotation – Order of Rotational Symmetry, if a shape, picture, or object has rotational symmetry, it will also have an order of symmetry.
Angle of Rotation – An angle of rotation is the measure of the amount that a shape is rotated about a fixed point called a point of rotation.

Shape	Centre of Rotation	Order of Rotation	Angle of Rotation
Square	Intersecting points of diagonals	4	${90}^{\circ }$
Rectangle	Intersecting point of diagonals	2	${180}^{\circ }$
Rhombus	Intersecting point of diagonals	2	${180}^{\circ }$
Equilateral Triangle	Intersecting point of medians	3	${120}^{\circ }$
Regular Triangle	Intersecting point of diagonals	6	${60}^{\circ }$
Circle	Centre	Infinite	At every point
Semi-circle	Midpoint of diameter	1	${360}^{\circ }$

Note – Whenever we come up with this type of question, one must know that we have to identify the table properly. By identifying the asked shapes and after that mentioning their asked rotations we can easily fill – up the blanks.