Answer:
4 * pi
Step-by-step explanation:
Given r = 10
Formula for the circumference of this full circle is:
2 * r * pi
2 * 10 * pi = 20 * pi
Given one (biggest) part = 16 * pi of this circle.
The other (smaller) part must therefore be:
20 * pi - 16 * pi
4 * pi
