Please help me !! Statistics !

What is the approximate circumference of the circle shown below?

This is the number of parts out of 100, the numerator of a fraction where the denominator is 100. submit

Which formula finds the probability that a point on the grid below will be in the blue area? p(blue) = total number of squares number of blue squares number of blue squares p(blue) = total number of squares number of blue squares p(blue) = number of white squares