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R = 1/2 * c
r = (a + b - c) / 2 = 1/2*a + 1/2*b - 1/2*c
(te wzory są w tablicach)
R + r = 1/2 * c + 1/2*a + 1/2*b - 1/2*c = 1/2 * a + 1/2 * b
2*(R+r) = 2 * 1/2 * a + 2 * 1/2 * b = a + b
c.n.u.