A triangle has sides of length 9 cm and 20 cm with an included angle of 17°. Find the expression for the height to the 20 cm side (not an approximation). Note that although the angle is in degrees and should have a degree symbol, this system is not set up to enter it. The height is . Using this expression for the height (not an approximation), calculate the area. The area of this triangle ≈ . The units are .