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Angles ke types aur unke naap

Class 6 Maths · Chapter 2: Lines aur Angles · NCERT Ganita Prakash section 2.11

Seekho

Ab har type ko uske naap se bata sakte hain. Acute angle: 0° se zyada aur 90° se kam.

Right angle: theek 90°. Obtuse angle: 90° se zyada aur 180° se kam.

Straight angle: theek 180°. Reflex angle: 180° se zyada aur 360° se kam, lamba raasta ghoomkar.

∠REB straight angle (180°) hai aur ∠TER = 80°. To baaki hissa, ∠BET, 180° − 80° = 100° hai.

180° − 80° = 100°

Reflex angle banao: arm ko seedhi line se aage ghumao.

Cycle ke pahiye mein barabar doori par 36 spokes hain. Ye poora chakkar baant-te hain, to paas-paas ke do spokes 360° ÷ 36 = 10° banate hain.

360° ÷ 36 = 10°

Yaad rakho

  • Acute: 0°–90°. Right: 90°. Obtuse: 90°–180°. Straight: 180°. Reflex: 180°–360°.
  • Straight angle ke hisse milkar 180°; poore chakkar ke hisse milkar 360°.

Quick check

200° ka angle … hai

  1. Acute
  2. Obtuse
  3. Straight
  4. Reflex
Answer

Reflex. 200°, straight angle (180°) se aage hai par abhi poora chakkar (360°) nahi, to reflex hai.

Socho

Paheli: mujhe double karo to main straight angle ban jaata hoon. Main kya hoon? Mujhe aadha karo to kya banunga?

Ek answer

Straight angle 180° hai, to main 180° ÷ 2 = 90° hoon, right angle. Mera aadha 45° hai, acute angle.

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.