Of the 4 people who have taken their seats at a seminar, 2 have red hair. Considering this data, how many of the next 16 people to take their seats should you expect to be red-haired?

Suppose that circtes a and b have a central angle measuring 100. additionally, the measure of the sector for circle a is 10 m2 and for circle b is 40 m2 if the radius of circle a is 6 m, what is the radius of circle b?