Use the Figure Below to Find the Exact Value of the Given

Multiple Choice

Use the figure below to find the exact value of the given trigonometric expression. $\cos \frac { \theta } { 2 }$

A) $\cos \frac { \theta } { 2 } = \frac { 7 \sqrt { 2 } } { 10 }$
B) $\cos \frac { \theta } { 2 } = \frac { 7 \sqrt { 2 } } { 7 }$
C) $\cos \frac { \theta } { 2 } = \frac { \sqrt { 2 } } { 10 }$
D) $\cos \frac { \theta } { 2 } = 7$
E) $\cos \frac { x } { 2 } = \frac { 7 \sqrt { 2 } } { 12 }$