Answer:
294.34 mm^2
Step-by-step explanation:
If r is the radius of a circle, the area of the circle is A = (pi)r^2.
If d is given, we find the radius by taking half of the diameter: r = d/2.
Here the diameter is 18 mm, and so the radius, r, is 9 mm.
The area of the dime is A = 3.14(9 mm)^2 = 3.14(81) mm^2 or 294.34 mm^2
