Pl...ask me any difficult question of volume surface area ?

1.	Pl...ask me any difficult question of volume surface area ?
Answer» In 2nd ques.- r of pipe=2cm ,length of pipe=7m/sec×30min (length=distance=speed ×time)=(7×30×60×100)cmNow,volume of pipe =volume of tank,^r2h=^r2h,(^cancel),2×2×7×30×60×100=40×40×h,h=12600cm,h=126m, is the correct ans. Ans. Of your 2nd ques. will be 31.5 m . Is it correct? Its vry easy u hve to 1st find the area of 1 circle then x(into) 2 and subtract it from area of rectangle. water is flowing at 7 m/sec through a circular pipe of internal diameter 4 cm into a cylindrical tank the radius of whose base is 40 cm find the increase water level in 30 minutes ?? 2 circular pieces of equal radii and maximum area touching each other are cut out from a rectangular cardboard of dimension 14×??7 find the area of remaining cardboard ??

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