Help with triangles

Hi All,

I am trying to remove a taper from a sloping roof thing. I don’t how to calculate the length I need to move the point downwards to create a roof element with a uniform thickness not the tapering shown here.

Edit: I know the radius this will stay the same always 442.5. The angle of the roof will vary as we adjust the slope for visual reasons.

In trigonometry you have that rule:

Length = radius/ Cos(40°)

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