g: X = [-3.5, 9.5, 6] + t·[-2.5, 6.5, 2]
EADE: X = [4, -4, 0] + r·[-8, 0, 0] + s·[-2, 2, 8]
EBCF: X = [4, 4, 0] + r·[-8, 0, 0] + s·[-2, -2, 8]
Schnittpunkt EADE ; g
S1 = [4, -4, 0] + r·[-8, 0, 0] + s·[-2, 2, 8] = [-3.5, 9.5, 6] + t·[-2.5, 6.5, 2] → r = 0.25 ∧ s = 0.25 ∧ t = -2
S1 = [-3.5, 9.5, 6] - 2·[-2.5, 6.5, 2] = [1.5, -3.5, 2]
Schnittpunkt EBCF ; g
S2 = [4, 4, 0] + r·[-8, 0, 0] + s·[-2, -2, 8] = [-3.5, 9.5, 6] + t·[-2.5, 6.5, 2] → r = 0.5 ∧ s = 0.5 ∧ t = -1
S2 = [-3.5, 9.5, 6] - 1·[-2.5, 6.5, 2] = [-1, 3, 4]
Länge des Bohrkanals
L = |[1.5, -3.5, 2] - [-1, 3, 4]| = |[2.5, -6.5, -2]| = 1/2·√210 = 7.246 cm