Well basically the formula for the area of the circle is pi r squared. First you square 3 which is 9 and then you times it by 3.14 which gives you 28.26.Hope this helps!
The last vertical line in a Box-and-Whisker plot is the upper quartile value, also know as 75% into the data. Since 75% is the same as three quarters and the last vertical line is on 12, C is the answer