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`:. overline(CA) = sqrt(27) = 3 sqrt(3) ` unit **Introduction**

**Physical meaning of a point and Co-ordinates of a point in space.**

**Distance formula + Derivation**

**What is Section formula And internal / external division formula**

**Find the coordinates of a point which divides the line segments joining the points `(1;-2;3) & (3;4;-5)` in the ratio `2:3` internally and externally**