Page 67 - Grade 10 C.Math

vGofpg'xf];\ . To;kl5 a]ngfdf uf]nfnfO{ lrqdf b]vfP h:t} ldnfP/ /fVg'xf];\ . gfKg]
efF8f]df /x]sf] kfgL k'gM uf]nf;lxtsf] a]ngfdf vGofpg'xf];\ . o;/L vGofpFbf uf]nf;lxtsf]
a]ngfdf Ps ltxfO kfgL dfq c6fpF5 / afFsL kfgL gfKg] ef8f]d} afFsL /xG5 . b'O{ ltxfO{ kfgL uf]nfn]
cf]u6]sf] cyjf lj:yflkt u/]sf] b]lvG5 . h;sf] cy{ uf]nfn] a]ngfsf] b'O{ ltxfO cfotg cf]u6]
sf] hgfpF5 . t;y{ uf]nfsf] cfotg (V) = -a]ngfsf] cfotg_ x'G5 .
Curriculum Development Centre
cyjf V = -a]ngfsf] cfwf/sf] If]qkmn x a]ngfsf] prfO_

= (A ×h) (A = a]ngfsf] cfwf/sf] If]qkmn / h = a]ngfsf] prfO_

= (πr × d)
2

= (πr × 2r)
2

= (2πr )
3
= πr 3

t;y{ uf]nfsf] cfotg (V) = πr x'G5, hxfF r = uf]nfsf] cw{Jof; xf] .
3

lj|mofsnfk 2

r

(i) (ii) (iii) (iv)

km/s km/s /ªsf t/ ;dfg cw{Jof;sf 20 cf]6f j[Ttx¿ sDkf;sf] ;xfotfaf6 tof/
ug'{xf];\ . cw{Jof; 4 ;]=ld= b]lv 6 ;]=ld= ;Ddsf] lng' pko'St x'G5 . To;kl5 k|To]s j[TtnfO{
lrqdf b]vfP h:t} cf7 a/fa/ efudf ljefhg ug'{xf];\ . k|To]s j[Ttsf] ltg efu sf6]/
x6fpg'xf];\ / afFsL kfFr efuaf6 dflysf] t];|f] lrq h:t} u/L lk/fld8 agfpg'xf];\ . o:tf 20
cf]6f lk/fld8x¿ tof/ eO;s]kl5 3-3 cf]6fsf rf/ ;d"x / 4-4 cf]6fsf b'O{ ;d"xdf ljefhg
u/L km]lasnn] 6fF:g'xf];\ . o;/L ;d"xsf] ljefhgdf km]lasnn] 6fFl;;s]kl5 s]xL a]/ ;'Sg
lbO;s]kl5 4-4 ;d"xsfdf 3-3 ;d"xsf lk/fld8 km]lasnn] 6fF:b} hfg'xf];\ . o;/L Pp6f uf]nfsf]
Pp6f df]8]n tof/ x'G5 . oxfF uf]nfsf] cfotg = 20 cf]6f lk/fld8x¿sf] cfotg x'G5 .

64 ul0ft, sIff –10