Question

A target consists of five concentric circles, each with a radius 1 inch longer than that of the previous circle. Calculate the area between the third and fourth circles from the center.

Answer 1

does the first circle have radius 1?

Answer 2

yes

Answer 3

the radius of the first circle is 1

Answer 4

then the fourth circle has radius 4 and the third circle has radius 3
area is
\[\pi r^2\] in general so fourth circle has area
\[16\pi\] and third has area
\[9\pi\] and the difference is
\[16\pi-9\pi=7\pi\]

Answer 5

YESSSS!!!!YOU GOT IT!!!....thanks so much...i have some more questions that i am going to post