If it’s not a right angle, then what is it? Wouldn’t you just measure the angle between the tangent of the curve and the line? Working with the tangents is how you find the angle between two curves as far as I know. You say it will never be exactly 90 degrees, but it would be 90 degrees at exactly that point. That’s not a weird thing to say from a math perspective.
I think a bigger issue with this figure is that they’re using some internal and external angles for their count of 90 degree angles. (And that this is just a ridiculous twist on a square, lol.)
If it’s not a right angle, then what is it? Wouldn’t you just measure the angle between the tangent of the curve and the line? Working with the tangents is how you find the angle between two curves as far as I know. You say it will never be exactly 90 degrees, but it would be 90 degrees at exactly that point. That’s not a weird thing to say from a math perspective.
I think a bigger issue with this figure is that they’re using some internal and external angles for their count of 90 degree angles. (And that this is just a ridiculous twist on a square, lol.)