g: X = [1, -2, -3] + r·[-5, 7, -3]
E: X = [-4, 5, -6] + r·[11, -13, 15] + s·[-6, 6, -6]
n = [11, -13, 15] ⨯ [-6, 6, -6] = [-12, -24, -12] = -12·[1, 2, 1]
E: x + 2·y + z = 0
i)
d = (x + 2·y + z - 0)/√(1^2 + 2^2 + 1^2)
d = (1 + 2·(-2) + (-3) - 0)/|[1, 2, 1]| = -√6 = -2.449
ii)
d = |([7, -8, 9] - [1, -2, -3]) ⨯ [-5, 7, -3]| / |[-5, 7, -3]| = 6/83·√14442 = 8.687
iii)
α = ASIN(|[-5, 7, -3]·[1, 2, 1]| / (|[-5, 7, -3]|·|[1, 2, 1]|)) = 15.60°
Das Vormachen hier entbindet dich nicht die Grundlagen im Lehrbuch nachzulesen.