y(N) C(a, b, 0) x (E) A (0, -40, 0) B (40, 0, -20) a. Evaluate the distance AB. The section BC is to be drilled in the direction of the vector 3i + 4j + k. b. Find the angle between the sections AB and BC. The section of pipe reaches ground level at the point C(a, b, 0). c. Write down a vector equation of the line BC. Hence find a and b.

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