Find $| \mathbf { a } \times \mathbf { b } |$

Multiple Choice

Find $| \mathbf { a } \times \mathbf { b } |$ , given that $| \mathbf { a } | = 2$ , $| \mathbf { b } | = 5$ , and the angle between a and b is $\frac { 5 \pi } { 6 }$ .

A) $5 \sqrt { 5 }$
B) $5 \sqrt { 2 }$
C) 10
D) 5
E) $5 \sqrt { 3 }$
F) $\frac { 5 \sqrt { 2 } } { 2 }$
G) $- 5 \sqrt { 5 }$
H) -5