Page 52 - Grade 10 C.Math

t/, a + b + c = 2s

a + b - c = a + b + c - 2c = 2s - 2c = 2(s - c)
c + a – b = a + b + c - 2b = 2s - 2b = 2(s - b)
c - a + b = a + b + c - 2a = 2s - 2a = 2(s - a)

h
Curriculum Development Centre

 ABC sf] If]qkmn

t;y{ e'hfx¿s]f gfk a, b / c ePsf] ljifdafx' lqe'h (scalene triangle) sf] If]qkmn
ju{ PsfO x'G5, hxfF s = cw{ kl/ldlt (semi perimeter) xf] .

pbfx/0f 1
cfwf/ e'hfsf] nDAffO 6 ;]=ld= / prfO 4 ;]=ld= ePsf] leq'hsf] If]qkmn lgsfNg'xf];\ .

;dfwfg

oxfF, cfwf/ e'hf (b) = 6 ;]=ld=
prfO (h) = 4 ;]=ld=

lqe'hsf] If]qkmn = ?

lqe'hsf] If]qkmn = x cfwf/ x prfO

= x 6 ;]=ld= x 4 ;]=ld=

= 12 ju{ ;]=ld=

49 ul0ft, sIff – 10