The radius of the semicircle in the following composite figure is 8.5 millimeters. what is the area of the semicircle rounded to the nearest hundredth?

226.87 mm2
907.46 mm2
113.43 mm2
453.73 mm2

The area of the circle is calculated through the equation,
                                A = πr²
With this reasoning, the value of the area of the semicircle is equal to 
                                       A = πr²/2
Substituting the known variables, 
                                          A = π(8.5 mm)²/2
                                          A = 113.49 mm²
Therefore, the answer is approximately 113.43 mm², third choice.