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If 0=28 and 32=37, what's 10? How do I calculate this? A rule of three seems to need an extra step.

1 Answer

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This will just be a linear interpolation.

H = height of whole trapezium

h = vertical distance from bottom edge you want to measure the width at

b = with of bottom edge

t = width of top edge

w(h) = the width at a given height h


w(h) = b + h * (t-b) / H

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