math formula for area of trapezoid

how do you find the area of trapezoid?

2;y=sin(midpoint);s=sum(h*y)12345trapezoid rule求梯形面积h=0.

19*1:应该使用了梯形公式/trapezoidformula19*3:应该使用了大名鼎鼎

quadrilateralsandare congruent, so hexagonsandhave the same area

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