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put a (major axis) in cell B1

put b (minor axis) in cell B2

put L (lenght of tank) in cell B3

and put variable height in cell

B6 to ....

put this formula to Microsoft excel in cell C6

=(B$1/2*B$2/2*ACOS(1-B6/B$2*2)-B$1/2*(B$2/2-B6)*SQRT(1-(1-B6/B$2*2)^2))*B$3

result will given in cell C6

Circuit B

B lymphocyte (B Cell)

Well firstly an antigen presenting cell like dendritic cell or macrophage is needed. Secondly you also need a T cell that is complementary to the B cell. B cell will only become plasma cell when it receives the full signal

1. Stimuli: CD4 from T cell interacting with BcR/antigen complex on B cell

2. Co-stimuli: CD40L (CD154) on T cell interacting with CD40 on B cell

This interaction allows T cell to secrete IL4, this binds to IL4R on B cell thus receive signal for proliferating and differentiating.

It refers to the cell where column B and row 2 meet each other.