1. Find VolumePyramid(A,B,C)
`A=(1,2,3)`,`B=(3,0,6)`,`C=(7,1,9)`

Solution:
Here `vec A=(1,2,3),vec B=(3,0,6),vec C=(7,1,9)`


Volume `=1/3|vec A * (vec B xx vec C)|`

1. Calculate scalar triple product
`A*(B xx C)`

`=|[A_1,A_2,A_3],[B_1,B_2,B_3],[C_1,C_2,C_3]|`

`=|[1,2,3],[3,0,6],[7,1,9]|`

`=1(0xx9-6xx1)-2(3xx9-6xx7)+3(3xx1-0xx7)`

`=1(0-6)-2(27-42)+3(3-0)`

`=1(-6)-2(-15)+3(3)`

`=-6+30+9`

`=33`

2. Calculate pyramid volume
Volume `=1/3 * 33=11`