Question

Please answer my question with solution or via picture if possible.

pg.394

Answer 1

option b) 6√3 is correct.

Answer 2

See image attached.
Angle between R₁ and R₂ is 60°

Vector product is also called cross product.
Magnitude of cross product of R₁ and R₂ is |R₁||R₂| sinθ
(where θ is angle between the vectors)

So,
Magnitude of cross product = (3 cm) × (4 cm) × sin60 = 6√3 cm²

(b) is the correct option.