Angle
Class 6 Maths · Chapter 2: Lines aur Angles · NCERT Ganita Prakash section 2.5
Seekho
Angle do rays se banta hai jo ek hi point se shuru hoti hain. Wo common point vertex hai, aur do rays angle ki arms hain.
Angle ka naam har arm ke ek point aur beech mein vertex se: ∠DBE ya ∠EBD. Jab B par ek hi angle ho, to sirf ∠B bhi keh sakte hain. Vertex par chhota curve batata hai kaunsa angle.
∠DBE = ∠EBD
Angle ka size ye hai ki ek arm ko vertex ke chaaron or kitna ghoomna padta hai taaki wo doosre arm par aa jaaye. Jaise-jaise Aditya apna laptop ka dhakkan kholta hai, angle badhta jaata hai.
Karke dekho: coral arm ghumao. Zyada ghumaav, bada angle.
Angles hamare chaaron taraf hain: khuli kainchi ke blade, compass ki arms, khula darwaza, aur ghadi ki suiyan.
Yaad rakho
- Ek hi point (vertex) se shuru hone wali do rays angle banati hain. Rays uski arms hain.
- Angle ke naam mein vertex beech mein: ∠DBE.
- Angle kitna bada hai = ek arm doosri tak pahunchne ke liye kitna ghoomti hai.
Quick check
∠PQR mein vertex kaunsa point hai?
- P
- Q
- R
- PR
Answer
Q. Vertex hamesha beech wala letter hai: Q.
Socho
Agar teen angles ka vertex P par ho, to unme se kisi ko sirf ∠P kyon nahi keh sakte?
Ek answer
∠P se pata nahi chalega teeno mein se kaunsa. Har arm ka ek point chahiye, jaise ∠APB.
Practice
Teen levels (easy, medium, hard) ke naye sawaalon se practice karo, kuch hands-on, hints aur hal ke saath. Topic poora karne ke liye pichhle 5 mein se 4 sahi karo.