This is just a rough drawing of what is needed to be found.
Here's the equation:
A botanist has been studying tree rings for a certain species of tree. A cross-section of a tree near the ground is shown (see picture above).
The botanist observes that:
1. After one year of growth, the trunk of the tree near the ground is approximately a circle with a 1 inch radius and  each successsive year's growth creates a ring with the same area as the original circle.
What I do not understand is how to find the area of the second ring (the ring around the innermost circle), when all that is given is radius of the smallest ring.
And how, the area will be the same as the original circle - without having the same radius. Hence: each successsive year's growth creates a ring with the same area as the original circle. Is the confusing part.
The Area of the smallest ring is A= 3.14 because the radius squared, which is 1 multiplied by pi, is pi itself.
How would the second ring be obtained?