Page 59 - Grade 10 C.Math

a]ngfsf] jj|m ;txsf] If]qkmndf a]ngfsf] b'O{lt/sf j[Ttsf] If]qkmn hf]8\g'xf];\ .

a]ngfsf] jj|m ;txsf] If]qkmn + b'O{ cf]6f j[Ttsf] If]qkmn =2πrh + 2πr ,
2
2
hxfF r = j[Ttsf] If]qkmn xf] .
t;y{ a]ngfsf] k'/f ;txsf] If]qkmn (TSA) = 2πr(h + r) ju{ PsfO / a]ngfsf] k'/f ;txsf]
If]qkmn = 2πr(h + r) ju{ PsfO x'G5 .

pbfx/0f 1

lbOPsf] a]ngfsf] ;dtn ;tx jj|m ;tx tyf k'/f ;txsf] If]qkmn lgsfNg'xf];\ .

;dfwfg

oxfF, a]ngfsf] prfO (h) = 14 ;]=ld=

a]ngfsf] cw{Jof; (r) = d/2=7 ;]=ld=/2 = 3.5 ;]=ld= 14 ;]=ld=
a]ngfsf] jj|m ;txsf] If]qkmn = ?

a]ngfsf] ;dtn ;txsf] If]qkmn = ?
Curriculum Development Centre
a]ngfsf] k'/f ;txsf] If]qkmn = ?
xfdLnfO{ yfxf 5,

a]ngfsf] jj|m ;txsf] If]qkmn = 2πrh 7 ;]=ld=

=44 × 7 = 308 ju{ ;]=ld=

a]ngfsf] ;dtn ;txsf] If]qkmn = b'O{ cf]6f j[Ttsf] If]qkmn

=22×3.5 =77.0 ju{ ;]=ld=

a]ngfsf] k'/f ;txsf] If]qkmn = jj|m ;txsf] If]qkmn + ;dtn ;txsf] If]qkmn

= (308 + 77) ju{ ;]=ld=

= 385 ju{ ;]=ld=

56 ul0ft, sIff –10