Chapter 7: Teen Kaat'ti Lines ki Kahaani
Jodiyon mein milti teen lines tribhuj banaati hain, sabse saral band aakaar. Is chapter mein hum compass aur protractor se tribhuj banaayenge, jaanenge kaunsi bhujaayein aur angles sambhav hain, saabit karenge ki angles hamesha milkar 180° hote hain, altitude kheenchenge, aur tribhujon ko bhujaon aur angles se sort karenge.
Is chapter mein tum
- bhujaon se, ya bhujaon aur angles se tribhuj banaana
- triangle inequality se bhuja-lambaai jaanchna
- angle jod gun aur bahari angles use karna
- altitude kheenchna aur tribhujon ka vargikaran
Topics
- Samabahu Tribhuj NCERT 7.1
Equilateral: teeno bhujaayein barabar; isosceles: do barabar.
- Teen Bhujaon se Tribhuj Banaana NCERT 7.2
Teen bhujaayein: aadhaar, phir siron se do chaap; kaat par teesra shirsh.
- Kuch Bhujaayein aur Angles Diye Hon NCERT 7.3
Tribhuj do bhujaon aur beech ke angle se, ya do angles aur beech ki bhuja se ban sakta hai.
- Tribhuj ke Altitude NCERT 7.4
Altitude shirsh se saamne ki bhuja (zaroorat ho to badhaayi) par lamb hai.
- Tribhuj ke Prakaar NCERT 7.5
Bhujaon se: equilateral, isosceles, scalene. Angles se: acute-, right-, obtuse-angled.
Key words
- Equilateral
- teeno bhujaayein barabar
- Isosceles
- do bhujaayein barabar
- Scalene
- saari bhujaayein alag
- Triangle inequality
- har bhuja baaki do ke jod se kam
- Angle sum property
- tribhuj ke angles milkar 180°
- Exterior angle
- ek bhuja aur doosri ke badhaav ke beech ka angle
- Altitude
- shirsh se saamne ki bhuja par lamb
Summary
- Compass se teesra shirsh aadhaar ke siron se do chaapon ke kaat par.
- Teen lambaaiyan tabhi tribhuj banaati hain jab sabse lambi baaki do ke jod se kam.
- Tribhuj ke angles milkar 180°; do angles ka jod 180° se kam.
- Altitude shirshon se lamb hain; tribhuj bhujaon aur angles se naamit.