Question

The area of the circle above is 1,519.76 units2. What is the circumference of the circle? (Use 3.14 for .)

Answer 1

\[A=\pi r^{2}=3.14r^{2}\]
A is given as 1519.76, so
\[1519.76=3.14r^{2}\]
Isolating r:
\[r^{2}=1519.76/3.14=484\]
Taking the square root of both sides gives
\[r=22\]
The circumference of a circle, given its radius, is
\[C=2\pi r=2*3.14*22=138.16\]
So, the circumference of the circle is 138.16 units.

Answer 2

\[A= \pi r ^{2}\]
A=Area of a circle
r=radius

\[C = 2 \pi r\]
C=Circumference
r=radius

Answer 3

thank you