The Figure Shows Four Vectors $\overrightarrow { \mathrm { A } }$

Essay

The figure shows four vectors, $\overrightarrow { \mathrm { A } }$ , $\overrightarrow { \mathrm { B } }$ , $\overrightarrow { \mathrm { C } }$ , and $\overrightarrow { \mathrm { D } }$ . Vectors $\overrightarrow { \mathrm { A } }$ and $\overrightarrow { \mathrm { B } }$ both have a magnitude of 7.0 cm, and vectors $\overrightarrow { \mathrm { C } }$ and $\overrightarrow { \mathrm { D } }$ both have a magnitude of 4.0 cm. Find the magnitude and direction of the sum of these four vectors.