Can someone help me?​

What is the approximate circumference of the circle shown below?

Find the length of the radius of a circle with the center at -7+2i and a point in the circle at 33+11i

What is the sum of the geometric series in which a1 = 7, r = 3, and an = 1,701? hint: cap s sub n equals start fraction a sub one left parenthesis one minus r to the power of n end power right parenthesis over one minus r end fraction comma r ≠ 1, where a1 is the first term and r is the common ratio