Chapter 6: Perimeter aur Area
Perimeter batata hai ki shape ke chaaron taraf kitni doori hai; area batata hai wo kitni jagah gherti hai. Is chapter mein hum rectangle, square aur triangle ke formulas dohraayenge, aur unse asli problems hal karenge jaise garden ki fencing ya farsh par tiles.
Is chapter mein tum
- rectangle, square, triangle aur regular polygons ka perimeter nikaalna
- rectangle aur square ka area, aur rectangles mein bati shapes ka area nikaalna
- squared paper se area ka andaaza lagana
- triangle ka area rectangle ke aadhe ke roop mein nikaalna
- dekhna ki same area ke alag perimeter ho sakte hain
Topics
- Perimeter NCERT 6.1
Polygon ka perimeter = saari sides ka jod.
- Area NCERT 6.2
Area wo jagah hai jo band shape gherti hai. Ise square units (sq cm, sq m) mein naapte hain.
- Triangle ka area NCERT 6.3
Diagonal rectangle ko do barabar triangles mein kaatta hai.
Key words
- Perimeter
- band shape ke chaaron taraf ki poori doori
- Polygon
- seedhi lines se bani band shape
- Area
- band shape jitni jagah gherti hai
- Square unit
- 1 unit side wala square (jaise 1 sq cm)
- Diagonal
- ek kone se saamne wale kone tak ki line
- Base and height
- triangle ki neeche wali side, aur upar wale point tak ki seedhi doori
Summary
- Perimeter kisi shape ke chaaron or ki doori hai: uski sides ki lambaiyaan jodo.
- Rectangle: perimeter = 2 × (lambai + chaudai). Square: perimeter = 4 × side.
- Area ye hai ki shape kitni chapti jagah gherti hai, unit squares (sq cm, sq m) mein gini jaati hai.
- Rectangle: area = lambai × chaudai. Square: area = side × side. Triangle: area = ½ × base × height.
- Same area wali shapes ke perimeter alag ho sakte hain, aur same perimeter wali shapes ke area alag ho sakte hain.