**1. Do the formulas for the mid-point and length of a line joining two points need to be memorised?**

No, although they are quite easy to learn, they are usually provided in tests and examinations.

**2. When finding the length of a line joining two points does a formula have to be used?**

No, if you draw a diagram, it is quite easy to use Pythagoras theorem without using a formula.

**3. Does it matter which point is POINT 1 and which point is POINT 2 when using a formula such as the one for the mid-point of a line between two points?**

It does not matter as long as x

_{1}and y_{1}both come from theSAMEpoint and x_{2}and y_{2}both come from the other point.