Answer:
Concentric circles
Explanation:
Given
Circle 1
![r = 3.6cm](https://img.qammunity.org/2022/formulas/mathematics/college/a8o0cfczravponjafw5y5f8kkhh5cekrd9.png)
Circle 2
![r = 4.5cm](https://img.qammunity.org/2022/formulas/mathematics/college/zvz8k6d6w4b44zx8497jj2p0lcka7ubs98.png)
Required
The name of the circles
See attachment for the circles.
From the attachment, the circle with radius 3.6cm is the circle with radius 4.5cm and they both have the same centre.
Such circles are referred to as concentric circles