Question
A figure is formed by revolving a rectangular sheet of
dimensions 7cm ×4cm about its length. What is the volume of   the figure. thus formed. (in cm 3 )Solution
Given – h= 7cm r = 4 cm Volume = πr2h = 22/7 ×4×4×7 =352cm3
What will be the error degree of freedom for testing 5 varieties of wheat in Latin Square Design?
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