Page 93 - Grade 10 C.Math

(d) ;f]nLsf] ;txsf] If]qkmn / cfotg
;f]nLsf] jj|m ;txsf] efunfO{ sf6]/ lkmhfpFbf j[Ttsf]
If]qs (sector) aG5 . o;sf] jj|m/]vfn] ;f]nLsf] kl/lwsf] h l
(circumference) k|ltlglwTj ub{5 . t;y{ kl/lw (C) = 2r x'G5 .

If]qsnfO{ cf7 a/fa/ efudf sf6]/ cfotfsf/ agfpFbf ;'?sf] ;f]nLdf r
Curriculum Development Centre
58\s] nDafO (l) cfotsf/ j:t'sf] nDafO tyf ;f]nLsf] kl/lwsf]
cfwf efu cfotfsf/ j:t'sf] rf}8fO aG5 . t;y{ b = r x'G5 .

pSt cfotsf] If]qkmn = b x l = rl ju{ PsfO
t;y{ ;f]nLsf] jj|m ;txsf] If]qkmn = rl
;f]nLsf] cfwf/sf] ;txsf] If]qkmn = r 2

;f]nLsf] k'/f ;txsf] If]qkmn = (r + rl) ju{ PsfO
2
= r(r + l) ju{ PsfO

;f]nLsf] cfotg (V) = cfwf/sf] If]qkmn x prfO

V = r h 3g PsfO
2
hxfF h = ;f]nLsf] prfO

pbfx/0f 7
lbOPsf] ;f]nLsf] cfotg / k'/f ;txsf] If]qkmn lgsfNg'xf];\ .

;dfwfg
B
oxfF ;f]nLsf] prfO OB (h) = 8 ;]=ld=

;f]nLsf] 58\s] prfO AB (l) = 10 ;]=ld=
;f]nLsf] cfwf/sf] cw{Jof; OA (r) = ?

;f]nLsf] cfotg (V) = ? 8 ;]=ld=
;f]nLsf] k'/f ;txsf] If]qkmn = ?

lrqdf BOA Pp6f ;dsf]0f lqe'hsf ¿kdf 5 . O O r =? A
PsfO

;]=ld=

;]=ld=

 ;]=ld=

90 ul0ft, sIff – 10