# The angle between two lines (Vector)

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

Determine the angle between the following vectors.

**a**= i + 3j + 5k**b**= 2i + 5j + 7k**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)**

- a & b = 5.6
- a & c = 84.8
- b & c = 88.3

## About Dr Loo - O-level & JC H2 math tutor

I am Dr Loo, a PhD holder with 8 years of teaching experience on secondary school and tertiary level specialize on mathematics and statistics. In addition, I also received teaching training under tertiary setting. Furthermore, I have published 5 research papers on international peer reviewed journals. If you are currently looking for secondary mathematics tuition or A-level math tuition in Singapore, I do provide O-level Math Tutoring & JC Math Tutoring (H1 Math Tuition Class & H2 Math Tuition Class).

Thus, for those who are looking for a JC Math Tutor (H1 Math tutor or H2 Math tutor) as well as O-level Math Tutor (E-math tutor or A-math tutor), you may contact me for my math tuition in Singapore. I can be contacted through SMS/Whatsapp/Telegram at +65-85483705.