A triangle is formed by the points A(1, 4), B(4, 7) and C(1, 7). Find the vectors representing the three medians of the triangle. (i) (a) A median joins one vertex to the midpoint of the opposite side. (b) Find the magnitude of each median. Give your answers in the form ab where a and b are constants.

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A: Vector addition

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A: To find the component of a in the direction of b