Question 1
The area of the shaded region is equal to $\frac17$ of the area of the big circle and is equal to $\frac15$ of the area of the small circle. The difference between the area of the big circle and the small circle is 18cm². What is the area of the small circle?
A. 36cm²
B. 72cm²
C. 90cm²
D. 126cm²
E. None of the above
**Editorial note for this self-study exercise:** Enter the numerical area in cm², without a unit or choice letter. The shaded region is the overlap shown in the original figure.
A. 36cm²
B. 72cm²
C. 90cm²
D. 126cm²
E. None of the above
**Editorial note for this self-study exercise:** Enter the numerical area in cm², without a unit or choice letter. The shaded region is the overlap shown in the original figure.