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**Note 1. To find ratio , using k:1.**

**if k is positive , then divides internally.**

**if k is negative , then divides externally.**

**Note 2. Two points P(x1,y1) and Q(x2,y2) divides a line ax + by + c = 0 in the ratio :**

**-(ax1 +by1 + c)/(ax2 +by2 + c)**

**if ratio is negative : divide externally.**

**if ratio is positive : divide internally.**