ok, the slope of the blue line is the same, some simple trig will point that out
√(13^2+5^2) = √194= 13.92...
there is a 21.8, 90, and 68.2 degree angle on the green triangle
and a 20.5, 90, 69.5 degree angle on the red
the big triangle has 21, 90, 69 degree angles, i can see how it works, but i cant think through it, oh well...
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