Question

find the circumference of the circle whose area is 16times the area of the cirlce with diameter 1.4cm

Answer 1

@Jhannybean

Answer 2

@mathmath333

Answer 3

\(\large\tt \begin{align} \color{black}{

A_c=16A_1
}\end{align}\)
u agree

Answer 4

yes

Answer 5

\(\large\tt \begin{align} \color{black}{

A_c=16A_1\\~\\
\pi (r_c)^2=16\pi (r_1)^2\\~\\
}\end{align}\)

Answer 6

is that ok

Answer 7

yes

Answer 8

\(\large\tt \begin{align} \color{black}{


(r_c)^2=16( r_1)^2\\~\\
r_c=4r_1
}\end{align}\)

ok

Answer 9

yes

Answer 10

\(\large\tt \begin{align} \color{black}{



r_c=4r_1\\~\\
r_c=2(2r_1)\\~\\
r_c=2(d_1)\\~\\
r_c=2(1.4)\\~\\
}\end{align}\)

is thatok

Answer 11

yes

Answer 12

\(\large\tt \begin{align} \color{black}{




r_c=2(1.4)\\~\\
r_c=2.8\\~\\
2\pi r_c=2\pi\times 2.8\\~\\

C=2\pi \times 2.8\\~\\
}\end{align}\)

Answer 13

is it 22 x 0.8?

Answer 14

\(C=2\times \dfrac{22}{7}\times 2.8\\~\\\)

Answer 15

i did that i got 44 x 0.8??

Answer 16

http://www.wolframalpha.com/input/?i=2%5Ctimes+%2822%2F7%29*2.8