The railway embankment 300 m long has a cross section of an isosceles trapezoid with bases of 14 m and 8 m. The trapezoidal arms are 5 m long. Calculate how much m3 of soil is in the embankment?

Correct result:

V =  13200 m3


l=300 m a=14 m c=8 m r=5 m  x=ac2=1482=3 m r2=h2+x2 h=r2x2=5232=4 m S=a+c2 h=14+82 4=44 m2 V=l S=300 44=13200 m3

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