Ditch

Ditch profile is an isosceles trapezoid with bases of length 80m and 60m. The slope of the side wall of the ditch is 80°. Calculate the ditch depth.

Correct result:

h =  56.7128 m

Solution:

a=80 m c=60 m x=(ac)/2=(8060)/2=10 m tan80=h/x  h=x tan80=tan4π/9=56.713=56.7128 m



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