For triangle Δ ABC

Cosine Law is

Here

- A, B, C are vertices of Δ ABC
- a is side opposite to A i.e. BC
- b is side opposite to B i.e. AC
- c is side opposite to C i.e. AB

Let’s look at its proof

###
**
Another way to remember cosine formula
**

Cosine formula can also be remembered as

Subscribe to our Youtube Channel - https://you.tube/teachoo