Class 9th Maths Circles | Most Important Questions

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[educational_line]

Ans :

In ∆AOB,
Since OA = OB = radius
<BAO = <ABO = 30°
[as angle opposite to equal sides]
Similarly, <OBC = 40°

So, <ABC = 70°
Therefore, <AOC = 2 X <ABC
= 2 X 70°
= 140°

So, x = 140°

[krrangarajan]

140 using angle sum property of triangle and angle around a point

[priyammallik]

In ∆ABC,
Angle BAO + Angle BCO = 2×angle AOC
Then,
30°+40°=70°
2×70°= 140°
Angle AOC = 140°

[crazyboyz]

solutions -
OA = OB (RADIUS )
angle - OAB= ABO
OB = OC (RADIUS )
ANGLE - ABC = ABO +OBC
ABC= 30 +40
ABC = 70
REFLEX AOC = 2ABC
REFLEX OF AOC = 2 X 70
REFLEX OF AOC = 140

[psvprasad]

angle ABC is 110°. Angle of arc subtented at the centre twice the angle subtended at any point of circle. if angle ABC =110 then angle AOC=220.

[AdarshPatel-ho]

110 ans hai angle sum property 30plus 40 is 180 subtract

[UltronZgaming-qori]

The real answer is 220° using theorem:9.7."Angle on centre is double of any angle made at any point at circle"😊

[Jentle_Shukla]

140 ans. Because r ao & r bo is equal then LB is 30 and same other triangle

[SīīləŋtKīīlər]

140 angle subtended by an arc at cente is double of angle subtended by remaining part

[PushpaKumari-qvvn]

Sum upper 2angles andMultiple with 2 we can know the lower angle . Hence it is140

[unknowngirl_salu]

55 is correct answer for this question

[Daksha_DP]

180-40=140
140-30=110
X=110
Hence proved

[RekhaVerma-kw]

30+40+x=180
70+x=180
X=180-70
x=110 ❤❤is write answer

[khyatiprabha]

Angle ABO =30 degree
Angle OBC= 40 degree
Both sum =70 degree
Angle AOC= 2 X angle ABC
=2 x 70
= 140 degree


Hope this helps