Find the Curvature of the Curve R(t) $\kappa = \frac { \sqrt { 2 } } { 2 }$

Multiple Choice

Find the curvature of the curve r(t) .
-r(t) = (8 + cos 9t - sin 9t) i + (5 + sin 9t + cos 9t) j + 7k

A) $\kappa = \frac { \sqrt { 2 } } { 2 }$
B) $\kappa = \sqrt { 2 }$
C) $\kappa = \frac { 9 } { 2 }$
D) $\kappa = \frac { 9 } { 2 } \sqrt { 2 }$