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The length of side BC can be found using the distance formula, which is:
Distance = √((x2 - x1)^2 + (y2 - y1)^2)
For points B (6, -3) and C (9, 1), the distance formula becomes:
BC = √((9 - 6)^2 + (1 - (-3))^2)
= √(3^2 + 4^2)
= √(9 + 16)
= √25
= 5
Therefore, the length of side BC is 5.