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"once in a blue moon": not very often
If the perimeter of rectangle is 54 cm and its length is 3 cm more than breadth then find its area?
A hollow spherical metallic ball has an external diameter 8cm and is 1/2cm thick. The volume of the ball (in cm cube) is.
A cylindrical tank has a radius of 7 meters and a height of 10 meters. How many liters of water can it hold? (1 cubic meter = 1,000 liters)
Find the area of the sector of a circle with radius 4cm and angle 30°.