function z = tobezeroTorus3( t )

% The tobezeroTorus3 function computes the volume of the torus from
% y = -t to y = t and then subtracts 20 from that value.  This function
% can be passed to Matlab's fzero in order to determine where the volume
% of the cut-off torus is equal to 20 (for Problem 3).

z = volumeTorus3(t) - 20 ;