Name: Real Life Examples on Symmetry
Uploaded: 2019-07-19
Duration: 1 min 32 s
Description: In this video, we will learn the concept of symmetry and various real-life examples of symmetry and the line of symmetry of different figures

Question

Draw a ceiling fan with three blades. Find the rotational symmetry of the blades of the ceiling fan. Write the order of symmetry.

Accepted Answer

There is a rough diagram for the ceiling fan with three blades can be shown as

If a shape looks exactly the same after rotation by a partial turn, it is said to possess rotational symmetry

The ceiling fan rotates about the axis passing through the centre and after every $120 °$ , the blade position is the same as the original position.

Thus, the angle of rotational symmetry of the blade of the ceiling fan is $120 °$

The order of rotational symmetry of a plane figure is, how many times a plane figure fits on to itself during a full rotation of $360 °$ degrees

Order of symmetry $= \frac{360 °}{120 °} = 3$

Hence, the blade has $120 °$ angle of rotational symmetry and the order of rotational symmetry is $3$

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Jharne De Mathematics Solutions for Exercise - Jharne De and Ranjana Kumar Solutions for Chapter: Symmetry, Exercise 3: Work it Out

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