1,2 and 4 please

PART B: VECTOR 1. [K/3 MARKS] Consider the cube ABCDEFGH with the side length equal to lucm. Find the magnitude of the following vectors. a) AB b) BD C) BH H G E F D A B 2. [C/ 4 MARKS] Prove or disprove each statement. a) If a = b then la |bl. b) If | a |=b | then a = b . 4. [A/ 4 MARKS] Two vectors are defined by a = 2 km [W] and b = 4km [S] Find the sum vector and the difference vector