# The angle between two lines (Vector)

Students are likely to learn this topic when they attend the A-level H2 math class.

*The following formulaue can be used to calculate the angle between two lines.*

Angle between two lines

cos y = **a**.**b**/(|**a**||**b**|)**a**.**b** is the scalar product of two vector

**Question**

Find out all the angles between the following vectors.

**a**= i + 5j + k**b**= i + 6j + 7k**c**= i – 2j + 10k

**Answer**

- a & b = 37.9
- a & c = 88.9
- b & c = 51.6

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