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Lines ke Beech

Class 7 Maths · Chapter 5: Parallel aur Intersecting Lines · NCERT Ganita Prakash section 5.3–5.4

Seekho

Rail ki patriyan, notebook ki lines aur sitar ke taar kabhi milte nahi dikhte. Ek hi samtal (plane) ki lines jo kitna bhi badhao kabhi na milein, parallel lines hain. Likhte hain l ∥ m.

l ∥ m

Ek hi plane zaroori: mez par kheenchi line aur blackboard ki line kabhi na milein, phir bhi parallel nahi kehlaati kyunki alag sataon par hain. Parallel lines har jagah barabar doori par rehti hain.

Kaagaz modna: varg kaagaz ke aamne-saamne ke kinaare parallel aur padosi kinaare perpendicular. Aadha modo: 3 parallel lines (2 kinaare + 1 silvat). Phir modo: 5, phir 9. Har mod patti double karta hai, to n mod se 2ⁿ + 1 lines.

1 fold → 3 · 2 → 5 · 3 → 9

Sanket: lines par ek jaise teer (>) dikhaate hain ki ve parallel hain; doosre parallel set par do teer (>>). Kone mein chhota varg perpendicular lines ke beech right angle dikhaata hai.

Explore: hamare aas-paas ki lines.

  1. Har jodi ko sort karo.

Yaad rakho

  • Parallel lines: ek plane, kabhi nahi milti, hamesha barabar doori.
  • Teer parallel lines dikhaate hain; chhota varg right angle.

Quick check

Kaunsi jodi parallel hai?

  1. panne par do lines jo barabar doori par rehti hain
  2. farsh aur chhat par alag disha ki lines
  3. door jaakar milti do lines
  4. 90° par milti do lines
Answer

panne par do lines jo barabar doori par rehti hain. Parallel lines ek plane mein, barabar doori par, kabhi nahi milti.

Socho

4 baar aadi disha mein modne par kitni parallel lines (dono kinaare milaakar)?

Ek answer

4 mod se 2⁴ = 16 pattiyan, to 16 + 1 = 17 lines.

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.