self Maths Puzzle

The thickness of a metallic pipe is 1
cm.
Its inner diameter is 12 cm. What is the volume of metal needed for a pipe of length 1m.

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self Other Question

if y=|x-2|+|2.5-x|+|3.6-x|, then y is minimum at
(a)x=2.3
(b)x=2.5
(C)x=2.7
(d)none of these
Ram is organising the dinner party.

Ram have a circular dining table.
Ram also have some china saucers(also circular).The diameter of table top is fifteen times the diameter of saucer. Ram would like to place saucer on the table so that they neither overlap each other nor the edge of the table.
Ram arrange in particular fashion.
how many can we place in this manner ?