:$.$ Dival ow below are several objects containing angu$-$

lar dimensions. Calculate the following anigles:

Included angle between $($Q$)$ and $($a$)$

Included angle between $($a$)$ and $($c$)$

Included angle between $($Q$)$ and $(0)$

Angle $()$

Angle $(3)$

Angle $($a$)$