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