Chapter 9: Symmetry
Titliyaan, rangoli, phool aur kai imaaratein santulit dikhti hain. Wo santulan symmetry hai. Is chapter mein hum aisi lines dhoondhenge jo shapes ko mirror hisson mein baantein, aur aisi shapes khojenge jo ghumaane par same dikhti hain.
Is chapter mein tum
- shapes, letters aur pictures mein lines of symmetry dhoondhna
- pictures ko poora karke symmetric banana
- rotational symmetry ka order aur angle dhoondhna
Topics
- Line of Symmetry NCERT 9.1
Line of symmetry shape ko do aise hisson mein baant-ti hai jo modne par bilkul milte hain.
- Rotational Symmetry NCERT 9.2
Rotational symmetry: shape poore chakkar se kam ghumaane par same dikhti hai.
Key words
- Line of symmetry
- shape ko do milte-julte mirror hisson mein baantne wali line
- Mirror image
- mirror mein dikhne wala roop
- Rotational symmetry
- poore chakkar se kam ghumaane par same dikhna
- Order of rotational symmetry
- ek poore chakkar mein shape kitni baar same dikhe
- Angle of symmetry
- sabse chhota ghumaav jiske baad shape same dikhe
Summary
- Line of symmetry figure ko do aise hisson mein baant-ti hai jo modne par bilkul milte hain.
- Figure mein koi line of symmetry nahi, ek, ya bahut saari ho sakti hain.
- Figure mein rotational symmetry tab hai jab wo apne centre par poore chakkar se kam ghumaane par same dikhe.
- Order × angle of symmetry = 360°.