What is the exact circumference of the circle?
A. 8 in
B. 16 in
C. 32 in
D. 48 in​

Half of 16 is 8 which is your radius,

8 x 3.14(pi) x 2(you always have to use this number because you just need it when solving circumference) = 50.24

Step-by-step explanation:

Formula of circumference:

radius(half of diameter or given radius) x pie/pi some people call it (3.14 or 22/7 use what is supposed to be used) x 2 (always 2)

step-by-step explanation:

points a and b are equidistant from the desired line, so the line you find by using them will go through point r.

using points other than a and b will give the desired line only if they are equidistant from r. if they are randomly located, the perpendicular line you create will not necessarily go through point r, hence will not be a solution to the problem.