Question

whats the circumference of the circle?

Answer 1

@phi

Answer 2

\[C = \Pi D\]

Answer 3

That may not help too much, I looked at the picture after..

Answer 4

r^2 would go in place of the 50 so the radius is 7.07... or 7. and since diameter is 2xr, the diameter would be 14. but thats not up there

Answer 5

they want you to notice the formula they gave you matches
\[ (x - x_0)^2 + (y-y_0)^2 = r^2 \]
that is the standard equation of a circle with a center at \( (x_0,y_0) \) and radius r

if you match that with your problem you match
\[ r^2 = 50 \]
and , if you take the square root,
\[ r = \sqrt{50}= \sqrt{2\cdot 5\cdot 5} = 5 \sqrt{2} \]

That is a lot of stuff to know...
But if you did know it, you would then say
\[ C= 2 \pi \ r \]