Final answer:
The area of the rectangular conductor is 99 circular millimeters, obtained by multiplying the thickness (9 mills) by the width (11 mills).
Step-by-step explanation:
To calculate the area of a rectangular conductor in circular millimeters, you only need to multiply the thickness by the width. Since both measurements are already provided in mills (which are equivalent to millimeters in this context), you can simply multiply them directly.
The formula for the area (A) of a rectangle is A = length × width. Using the given thickness of 9 mills as the length and the width as 11 mills, the calculation would be:
A = 9 mills × 11 mills = 99 square mills,
which is 99 mm² since 1 mill is equal to 1 mm. Therefore, the area of the rectangular conductor is 99 circular millimeters.