Page 87 - Grade 10 C.Math

-3_ 58\s] ;txx¿ ;dtn / lqe'hfsf/sf x'G5g\ .
-ª_ lk/fld8sf] cfotg cfwf/sf] If]qkmn / 7f8f] prfOsf] u'0fg kmnsf] Ps ltxfO x'G5 . cyf{t\

lk/fld8sf] cfotg (V) = cfwf/sf] If]qkmn x 7f8f] prfO

V = Ah hxfF, lk/fld8sf] cfwf/sf] If]qkmn = A, 7f8f] prfO = h xf] .
Curriculum Development Centre
oxfF ju{ cfwf/ ePsf] lk/fld8;Fu ;DaGwL ;d:ofx¿ dfq cWoog ul/G5 .

lj|mofsnfk
lk/fld8sf] cfotg cfwf/sf] If]qkmn / prfOsf] u'0fg
kmnsf] Ps ltxfO x'G5 . o; ;DaGwL ;"q lgsfNgsf

nflu tn lbOPsf] hfnLsf cfwf/df juf{sf/ cfwf/ ePsf]
Pp6} gfksf ltg cf]6f lk/fld8 agfpg'xf];\ . ltg cf]6f
lk/fld8sf] hf]8fOaf6 Pp6f 3gfsf/ j:t' tof/ x'G5 .
o;sf] cfwf/df ltg cf]6f lk/fld8sf] cfotg a/fa/ Pp6f
3gsf] cfotg x'G5 egL k|:6 x'G5 . t;y{ Pp6f 3gsf]
cfotg = ltg cf]6f lk/fld8sf] cfotg x'G5 . cyjf 3gsf]
cfotg = 3 lk/fld8sf] cfotg

cyjf V = Pp6f lk/fld8sf] cfotg x'G5 .

lk/fld8sf] cfotg (V) = x cfwf/sf] If]qkmn x 7f8f] prfO

V = Ah

(b) lk/fld8sf] ;txsf] If]qkmn (Surface area of a pyramid)
P
1. 58\s] prfO (slant height, l) / cfwf/ e'hf (a) sf]
gfk lbOPsf] cj:yfdf ju{ cfwf/ ePsf]
lk/fld8sf] k'/f ;txsf] If]qkmn slt xf]nf <
oxfF, ju{sf] If]qkmn = -e'hf_ ju{ PsfO l h
2
A D
2
= a ju{ PsfO
M O
rf/ cf]6f 58\s] ;txsf] If]qkmn = 4( x cfwf/ x 58\s] prfO_
B C
= 4( x a x l) a
= 2al ju{ PsfO

84 ul0ft, sIff – 10