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[RESOLVED] Circular segment height?

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So i have an assignment at school. the first part of the assignment is finding out how many litres of liquid are in a cylinder. I have the following variables:

d = 50 cm (diameter of circle)
L = 120 cm (length of cylinder)
h = 10 cm (height of circular segment)

The Figure to the left is sideview of the cylinder, and the figure to the right is front view.
Name:  shape.jpg
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first part is easy.
Find out how much liquid is in the cylinder
Code:

A=r^2/2 * ((pi*v)/180 - sin(v))
A=312,5*(1,854587-0,96)=279,5581 cm^2

V_(cylinder) = 279,5581 cm^2 * 120 cm = 33546,97 cm^3
V_(cylinder) = (33546,97 cm^3)/(1000 cm^3/L) = 33,54697 L

now the second part is where i'm stuck at.
i need to find the new height of the circular segment, if i add 50 L liquid. so our new V_(cylinder) is 50 + 33,54697 = 83,54697 L.

how would i go about doing this? i can't exactly isolate V from the previous formula?
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