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# 4. If p , q , r are in arithmetic progression, then prove that ( q + r ) 2 − p 2 , ( r + p ) 2 − q 2 , ( p + q ) 2 − r 2 are also in arithmetic progression.

Answered by Expert 15th March 2017, 10:17 AM

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## The rain water from a roof 22 m × 20 m drains into a conical vessel having a base of diameter 2 m and height 3.5 cm. If the vessel is just full, find the rainfall in mm.

Asked by shailesh.solanki 18th March 2018, 7:37 PM

## The rain water from a roof 22 m × 20 m drains into a conical vessel having a base of diameter 2 m and height 3.5 cm. If the vessel is just full, find the rainfall in mm.

Asked by shailesh.solanki 18th March 2018, 7:35 PM

## A wooden toy was made by scooping out a hemisphere of same radius from each end of a solid cylinder. If the height of the cylinder is 10 cm, and its base is of radius 3.5 cm, find the volume of wood in the toy. Use pie=22/7

Asked by shailesh.solanki 18th March 2018, 7:34 PM