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|dw:1353134091614:dw|

yes

how did you get 42.5 below 40.5?

it was written down on my map

hmm doesnt make sense...
i find the scale factor

126 is the true height difference?

and i had to measure the triangle to find the elevation which i measured out to be 126

@chemENGINEER do you know how to do this?

i measure the triangles 1:20" scale

i'll try and upload it tomorrow because its huge

it is contour interpolation @AbhimanyuPudi

the elevation from 42.5 to 40.5 is correct in w/c you got elevation=2

average slope = rise / run

what do i do next?

do i multiply the 2 by 126 and divide by 2?