Answer:

Step-by-step explanation:

We need the image to help you
First and third, second can still be simplified.
D. centimeters (cm)
km is too large of a unit for this measurement, kg is a unit of weight not distance, mm is small but you'd rather choose cm
To find the area of the shaded region you must subtract the area of the circle from the area of the square. , where is the side of the square and is the radius of the circle.