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radius A				▶
	0	0	5
a =	curvature of A =		=
radius B				▶
	0	0	5
b =	curvature of B =		=
radius C				▶
	0	0	5
c =	curvature of C =		=

d (curvature D) = \(a + b + c + 2\cdot \sqrt{(a\cdot b + a\cdot c + b\cdot c)} = \)

radius D = \(\frac{1}{d} = \)

e (curvature E) = \(a + b + c - 2\cdot \sqrt{(a\cdot b + a\cdot c + b\cdot c)} = \)

radius E = \(\frac{1}{e} = \)