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# The angle between two lines (Vector)

### The angle between two lines – Vector (Question)

Determine the angle between the following vectors.

1. a = i + 3j + 5k
2. b = 2i + 5j + 7k
3. c = i – 3j + 2k

Guide:

Angle between two lines

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

### The angle between two lines – Vector (Answer)

1. a & b = 5.6
2. a & c = 84.8
3. b & c = 88.3

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