Question

If the radius of a circle is multiplied by 4, then how many times larger is the circumference of the new circle?

Answer 1

\[A_{\text{circle}}=\pi r^2\]

Answer 2

would it be 4

Answer 3

these are the given choices
2.
4
8
and pie

Answer 4

\[A_{\text{circle}_1}=\pi (r_1)^2\]
\[A_{\text{circle}_2}=\pi (r_2)^2\]
\[r_2=4r_1\]

Answer 5

so 4 would be correct

Answer 6

ops looks like i have mis read the question sorry @alijahe

Answer 7

the question is asking us to compair the Circumference of the circles , not the areas.

Answer 8

\[C=2 \pi r\]\[C_1=2 \pi r_1\]\[C_2=2 \pi r_2\]
\[r_2=4r_1\]

Answer 9

ohh ok

Answer 10

\[\frac{C_2}{ C_1}=\frac{2\pi r_2}{2 \pi r_1}=\frac{2\pi \times4 r_1}{2 \pi r_1}\]

Answer 11

what do you get ?

Answer 12

4 after i complete all the work

Answer 13

that is correct.

Answer 14

thank you