Page 68 - Grade 10 C.Math

ctM uf]nfsf] cfotg = 20 ( x cfwf/sf] If]qkmn x prfO)

= 20( ) × (a) × (r) [  lk/fld8sf] prfO = cw{Jof;]

= 20( )ar, hxfF a = lk/fld8sf] cfwf/sf] If]qkmn
Curriculum Development Centre
= (20a)r, 20a = 20 cf]6f lk/fld8sf] cfwf/x¿sf] If]qkmn

]
2
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= (4πr )r [20 cf6f lk/fld8sf cfwf/sf Ifqkmnaf6 ufnfsf ;tx aG5 ]
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=( )πr
3
t;y{, uf]nfsf] cfotg (V) =( )πr 3g PsfO x'G5 .
3

(c) cw{uf]nfsf] ;txsf] If]qkmn / cfotg (Surface Area and Volume of Hemisphere)

oxfF, cw{uf]nfsf] ;txsf] If]qkmn = cw{uf]nfsf] jj|m ;txsf] If]qkmn + j[Ttsf] If]qkmn
2
2
2
= 2πr + πr = 3πr
t;y{ cw{uf]nfsf] k'/f ;txsf] If]qkmn =3πr ju{ PsfO x'G5 .
2
To:t} u/L cw{uf]nfsf] cfotg (V) = -uf]nfsf] cfotg_

t;y{ cw{uf]nfsf] cfotg (V) 3g PsfO x'G5 .

pbfx/0f 1

cw{Jof; 3.5 ;]=ld= ePsf] Pp6f uf]nfsf] ;txsf] If]qkmn / cfotg lgsfNg'xf];\ .

;dfwfg
oxfF, cw{Jof; (r) =3.5 ;]=ld=

uf]nfsf] ;txsf] If]qkmn (SA) = ?

uf]nfsf] cfotg (V) = ?
xfdLnfO{ yfxf 5,

65 ul0ft, sIff – 10