A.A.
\(\overrightarrow {AB} + \overrightarrow {CD} + \overrightarrow {FA} + \overrightarrow {BC} + \overrightarrow {EF} + \overrightarrow {DE} = \overrightarrow 0 \)
B.B.
\(\overrightarrow {AB} + \overrightarrow {CD} + \overrightarrow {FA} + \overrightarrow {BC} + \overrightarrow {EF} + \overrightarrow {DE} = \overrightarrow {AF} \)
C.C.
\(\overrightarrow {AB} + \overrightarrow {CD} + \overrightarrow {FA} + \overrightarrow {BC} + \overrightarrow {EF} + \overrightarrow {DE} = \overrightarrow {AE} \)
D.D.
\(\overrightarrow {AB} + \overrightarrow {CD} + \overrightarrow {FA} + \overrightarrow {BC} + \overrightarrow {EF} + \overrightarrow {DE} = \overrightarrow {AD} \)
