2014-9: Going Ballistic

The following formula gives the horizontal distance a projectile travels:

d = v^2 * sin(2θ) / G

Where: v is the initial velocity, θ is the trajectory in degrees, d is the horizontal distance and G is the gravitational constant.

Write code which calculates the distance (in meters) a projectile travels given an initial velocity in meters per second and a trajectory in degrees. Use 9.8 meters per second squared as the gravitational constant.