coordinate

Question: The points $(a,b),\ (c,d)$and $\left( \frac{kc+la}{k+l},\,\frac{kd+lb}{k+l} \right)$ are



1) Vertices of an equilateral triangle
2) Vertices of an isosceles triangle
3) Vertices of a right angled triangle
4) Collinear
Solution: Explanation: No Explanation
geometrical conditions

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