Maths Symmetry part 11 (What is Rotational Symmetry) CBSE Class 7 Mathematics VII  Summary and Q&A
TL;DR
Rotational symmetry is when an object looks the same after being rotated by some angle, and this video explains the concept using examples.
Key Insights
 😥 Rotational symmetry is a geometric property where an object maintains its shape after rotation around a central point.
 👀 To have rotational symmetry, the object must look identical at different positions of rotation within an angle less than 360 degrees.
 🧘 Objects with rotational symmetry can have multiple identical positions of rotation within the given angle.
 🧘 Not all objects have rotational symmetry; only some display identical positions of rotation.
 🆘 Rotational symmetry helps in understanding the geometric properties and transformations of objects.
 ❓ The concept of rotational symmetry is essential in mathematics, particularly in geometry and symmetry analysis.
 🔺 It is necessary to rotate an object by some angle greater than 0 and less than 360 degrees to determine its rotational symmetry.
Transcript
hello friends this video on symmetry part 11 is brought to you by exam for calm no more fear from exam and it does understand what exactly is rotational symmetry so an object I said to have rotational symmetry if there is a point around which the object when rotated by some angle the object looks the same so let us try to understand this with the h... Read More
Questions & Answers
Q: What is rotational symmetry?
Rotational symmetry is a geometric property of an object that remains unchanged when it is rotated by a certain angle around a central point. The object looks the same at various positions of rotation within this angle.
Q: How can we identify if an object has rotational symmetry?
To determine if an object has rotational symmetry, we need to rotate it by various angles less than 360 degrees and observe if it maintains the same appearance at different positions of rotation. If it does, the object possesses rotational symmetry.
Q: What happens when an object has rotational symmetry?
When an object has rotational symmetry, it means that it has specific positions of rotation in which it looks identical. These positions occur at angles less than 360 degrees.
Q: Do all objects have rotational symmetry?
No, not all objects have rotational symmetry. Only those objects that show identical positions when rotated by certain angles less than 360 degrees possess rotational symmetry.
Summary & Key Takeaways

Rotational symmetry is a concept in which an object maintains its shape when rotated by a certain angle around a central point.

An object with rotational symmetry will have identical positions at angles less than 360 degrees.

Not all objects possess rotational symmetry, but those that do show identical positions at specific angles of rotation.