Q. 14 A54.6( 5 Votes )

In the adjoining figure, if O is centre of circle, the value of POR is


A. 20

B. 40

C. 60

D. 80

Answer :

In ΔORQ,


ROQ = 180 – 40 – 40


ROQ = 100°


In ΔPOQ,


POQ = 180 – 10 – 10


ROQ = 160°


POR = 160 – 100


POR = 60°

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Let us write in the following by understanding it.

i. In a circle, there are number of points.


ii. The greatest chord of the circle is.


iii. The chord divides the circular region into two.


iv. All diameters of the circle pass through.


v. If two segments are equal, then their two arcs are in length.


vi. The sector of the circular region is the region enclosed by the arc and the two.


vii. The length of the line segment joining the point outside the circle and the center is than the length of radius.

West Bengal Board - Mathematics