The area of a smaller circle is equal to the area of a sector of a larger circle with central angle 120°. The radii of the smaller and larger circles are 'r' and 'R' respectively. Find r : R.

Question

TextArea of Sector of a CircleCBSE PYQ

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The ratio of the area of a quadrant of a circle to the area of the same circle is :

The perimeter of the shaded region in the given figure is :

In the given figure, O is the centre of a circle of radius 7 cm. AB is a chord of the circle. Find the perimeter of the shaded region.

The perimeter of a quadrant of a circle of circumference 22 cm is :

The angle of the sector of a circle whose area is one-eighth of the area of the circle is :

OAB is sector of a circle with centre O and radius 7 cm. If length of arc AB = 22/3 cm, then ∠AOB is equal to