Question

If the vectors (i + i + k) and 3î form two sides of
a triangle, then area of the triangle is :
(1) V3 unit
(2) 213 unit
(3) 5 unit
(4) 3/2 unit

Answer 1

Area of triangle =1/2(length ×height)

=1/2(i+j+k)(3i)

=1/2(3i.i)+(3i.j)+(3i.k)

=1/2(3)+(0)+(0)

=3/2 unit

Option 4 is correct