Question

What is the circumference of the circle whose equation is (x - 9)2 + (y - 3)2 = 64?

8p
64p
16p
4p

Answer 1

Circumference is defined as C = 2pi r

The missing piece is knowing the radius.

Can you determine the radius of our circle in question? Perhaps you can find the r value from the circle equation.

Once you know the radius, you can substitute the radius r into your C = 2pi r and determine your circumference

Answer 2

i have no clue on how to find the radius

Answer 3

This is the general form of a circle equation\[(x-a)^2 + (y-b)^2 = r^2\]

Answer 4

ohh so its 8p?

Answer 5

\[r^2=64\]so\[r=8\]

If C = 2pi r, and r = 8

What is C?

Answer 6

16?