Page 158 - Grade 10 C.Math

PsfO 15
j[Tt (Circle)

15.0. k'g/fjnf]sg (Review)
Curriculum Development Centre
tn lbOPsf j[Ttsf cfwf/e"t wf/0ffx¿sf af/]df ;d"xdf 5nkmn ug'{xf];\ . ;fy} k|To]s
wf/0ffnfO{ k|:6\ofpg] HofldtLo lrq klg agfpg'xf];\ M

-s_ kl/lw (circumference) -v_ cw{Jof; (radius)

-u_ Jof; (diameter) -3_ hLjf (chord)

-ª_ cw{j[Tt (semi-circle) -r_ rfk (arc)
-5_ j[Ttv08 (segment) -h_ If]qs (sector)

-em_ Ps s]lGb|t j[Ttx¿ (concentric circles)

-`_ k|ltR5]lbt j[Ttx¿ (intersec ng circles)
-6_ a/fa/ j[Ttx¿ (equal circles)

15.1 s]Gb|Lo sf]0f / kl/lw sf]0f (Central angle and angel at circumference)
P
Pp6f l;Ssfsf] aflx/L 3]/fnfO{ 6«]; u/L j[Tt lvRg'xf];\ .
pSt j[Ttsf] s]Gb| cg'dfg u/L b]vfpg'xf];\ . j[Ttdf
O
s'g} Pp6f hLjf lvRg'xf];\ . pSt hLjfsf 5]psf laGb'x¿nfO{
s]Gb|;Fu hf]8\bf ag]sf sf]0fx¿sf] gfd n]Vg'xf];\ . A B
s]Gb|df ag]sf] sf]0fnfO{ s]Gb|Lo sf]0f elgG5 . ;Fu}sf]
D
lrqdf AOB s]Gb|Lo sf]0f xf] .

lrqdf O j[Ttsf] s]Gb| 5 . OA / OB j[Ttsf b'O{ cw{Jof;x¿ O
x'g\ . rfk ACB / rfk ADB df ag]sf s]Gb|Lo sf]0fx¿sf] gfd A B
n]Vg'xf];\ . s] rfk / s]Gb|Lo sf]0flar k|ToIf ;DaGw 5 < C
5nkmn ug'{xf];\ .

AOB  ACB nfO{ rfk ACB sf] l8u|Ldf gfk egL k9\g] ul/G5 . s]Gb|Lo sf]0f / ;Dd'v
rfklar k|ToIf ;DaGw x'G5 . oxfF ;ª\s]t  cyjf nfO{ ;Dk|efjL (Equal influence) eg]/

klg k9g] ul/G5 . To;}n] dflysf] lrqdf AOB ;Dk|efjL rfk ACB nfO{ OB  ACB åf/f
klg hgfpg] ul/G5 .

155 ul0ft, sIff – 10