A windmill has blades that are 10.8 m in length, and the center of their circular motion is a point 14.5 m above the ground. The blades have a frequency of 6 revolutions per minute when in operation. Assuming that the tip of a blade is at the lowest point at the start of the rotation, use a sinusoidal function to model the height above the ground of the tip of the blade as a function of time and calculate how far off the ground is the tip of the blade at 55 seconds? Note: round your answer to two decimal place values. The tip of the blade is ___ m above the ground at 55 seconds.