Khaas tarah ke Angles
Class 6 Maths · Chapter 2: Lines aur Angles · NCERT Ganita Prakash section 2.8
Seekho
Ek darwaaza socho. Jab Aditi use poora ghumaakar wapas wahin le aaye, wo poora chakkar hai. Jab wo bilkul ulti taraf khul jaaye, wo aadha chakkar hai: dono arms ek seedhi line banate hain, straight angle.
Kaagaz ko aise modo ki arm OB, arm OA par aa jaaye. Tah (crease) straight angle ko do barabar angles mein baantti hai. Har ek right angle hai. To straight angle mein do right angles hain.
Right angle chauthai chakkar hai aur L jaisa dikhta hai. Jo do lines right angle par milti hain unhe perpendicular lines kehte hain.
Right angle se chhote angles acute hain (acute matlab nukeela). Right angle se bade par straight angle se chhote obtuse hain (obtuse matlab bhotha).
Right angle banao: coral arm ko tab tak ghumao jab tak L na ban jaaye.
Yaad rakho
- Poora chakkar: poora ghoomna. Straight angle: aadha chakkar, arms ek seedhi line mein.
- Right angle: chauthai chakkar, straight angle ka aadha, L jaisa. Perpendicular lines right angle par milti hain.
- Acute: right angle se chhota. Obtuse: right angle aur straight angle ke beech.
Quick check
Kitne right angles milkar straight angle banate hain?
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- 4
Answer
2. Straight angle ko aadha modne se do barabar right angles milte hain.
Socho
4 kaanch wali classroom ki khidki mein kitne right angles dhoondh sakte ho?
Ek answer
Har rectangle kaanch ke kono par 4 right angles: 4 × 4 = 16. Jahan frame milte hain wahan aur bhi!
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.