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) ​ $\cos \frac { x } { 2 } = \frac { 7 \sqrt { 2 } } { 12 }$