7. Given that $\overrightarrow{A} + \overrightarrow{B} = \overrightarrow{C}$, and that $A^2 + B^2 = C^2$, how are $\overrightarrow{A}$ and $\overrightarrow{B}$ oriented relative to one another?
8. Given that $\overrightarrow{A} + \overrightarrow{B} = \overrightarrow{C}$, and that $A + B = C$, how are $\overrightarrow{A}$ and $\overrightarrow{B}$ oriented relative to one another?
9. Given that $\overrightarrow{A} + \overrightarrow{B} = \overrightarrow{C}$, and that $A - B = C$, how are $\overrightarrow{A}$ and $\overrightarrow{B}$ oriented relative to one another?