Finding Magnitude and Direction of Vector Addition and Subtraction

[luckylayla]

vector A has a magnitude of 81 units and points due west, while vector B has the same magnitude and points due south. Find the magnitude and direction of (a) A + B and (b) A - B . Specify the directions relative to due west.

(a) Magnitude and direction of A + B = and o
(b) Magnitude and direction of A - B = and o
Hi folks any idea?

 

[rock.freak667]

Try drawing it out firstly and what does A+B mean in vector notation? (How do you 'add' two vectors?)