## 1. Distance Formula :

## Note : If three points are collinear then –

2. Section Formula :

## Note : If P is the mid – point of AB , then –

3. Area of Triangle :

Note : If three points A, B and C are collinear then –

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2. Section Formula :

3. Area of Triangle :

Note : If three points A, B and C are collinear then –

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