Question

Let ∆PQR be a triangle. Let  vector = vector((QR), b) = vector RP and vector c = vector PQ. if |vector a| = 12, |vector b| = 4√3 and vector(b x c) = 24, then which of the following is (are) true

(A) |vector c|²/2 - |vector a| = 12

(B) |vector c|²/2 - |vector a| = 30

(C) vector|a x b + c x a| = 48√3

(D) vector(a x b) = -72

Answer 1

Correct option (A, C, D)

Explanation:

In ∆PQR