Page 64 - Grade 10 C.Math

cyjf, r – 6r + 14r – 84r + 84r – 504 = 0
3
2
2
cyjf, r (r – 6) + 14r(r – 6) + 84(r – 6) = 0
2
cyjf, (r – 6)(r + 14r + 84) = 0
2
 r = 6 ;]=ld= [ oxfF r sf] dfg k"0f{ ;ª\Vofsf ¿kdf cfpg] ePsfn] bf];|f] ;dLs/0faf6 r lgsfNg
cfjZos 5}g ]
Curriculum Development Centre
h = 6 + 8 = 14 ;]=ld= / r + h = 20

k'/f ;txsf] If]qkmn (TSA) = 2πr(r + h) ju{ PsfO

ju{ ;]=ld=

= 754.28 ju{ ;]=ld=

cEof; 6.1

1. tn lbOPsf gfkcg';f/sf] a]ngfsf] jj|m ;tx / k'/f ;txsf] If]qkmn lgsfNg'xf];\ M

(i) cw{Jof; (r) = 3.5 ;]=ld= / prfO (h) = 5 ;]=ld=

(ii) cw{Jof; (r) = 2.1 ;]=ld= / prfO (h) = 6 ;]=ld=

(iii) cw{Jof; (r) = 2.8 ;]=ld= / prfO (h) = 7 ;]=ld=

(iv) cw{Jof; (r) = 4.2 ;]=ld= / prfO (h) = 4.9 ;]=ld=

2. tn lbOPsf a]ngfx¿sf] jj|m ;tx / k'/f ;txsf] If]qkmn lgsfNg'xf];\ M

(a) (b) (c)

14 ;]=ld= 7 ;]=ld= 10.5 ;]=ld=

61 ul0ft, sIff – 10