Question

The area of the triangle formed by 2i +j- k and i + j+ k is?
The options are
a) three square unit
b) 2 root 3 square unit
c) 2 root 14 square unit
d) root 14 by 2 square unit
Please explain how to solve it?

Answer 1

b is the correct answer. Am I right

Answer 2

the question can be solved by the cross product method

then apply the formula of area of triangle i.e. 1/2bh

therefore the solution would be root 14 by 2 square unit