If the vertices of a triangle are A(k,2k), B(-2,6), C(3,1) and its area is 5 sq.units, then the values of k are
2, 2/3
7,30
6, 13/21
3. 5
If an equilateral triangle ABC is drawn as shown below with A(0,0) and a side of 4 units then the other two vertices of the triangle are___