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in trpezoidal rule for numerical integration how you can find error
Yes.
a trapezoidal prism
A right trapezoidal prism has 12 sides. Any prism has three times the number of sides of its cross-sectional shape. A trapezoid has four sides, so a [right] trapezoidal prism has 3 x 4 = 12 sides.
It's because the diagonal line on each trapezoid cuts down on the error of your area estimation. It is the average of the left and right rules.