Question

What is the angle between `<-7,4,-7 >` and `< 4,3,0 >`?

Answer 1

`theta=107.44^@`

Explanation:

`cos theta = (<-7,4,-7>*<4,3,0>)/(sqrt((-7)^2+4^2+(-7)^2) sqrt(4^2+3^2+0^2)`
`cos theta=(-7(4)+4(3)+(-7)(0))/(sqrt114 sqrt25)`
`theta=cos^-1 (-16/sqrt2850) = 107.44^@`