The radius of a circle is
always half of the diameter of the circle. In this case, the diameter is
![4](https://img.qammunity.org/2019/formulas/mathematics/college/vy7w0y8mahjstsdj98ba7ooazymifwl1vi.png)
, meaning that when we halve
![4](https://img.qammunity.org/2019/formulas/mathematics/college/vy7w0y8mahjstsdj98ba7ooazymifwl1vi.png)
, we will get our radius. Therefore, the radius of the circle is
![\boxed{2}](https://img.qammunity.org/2019/formulas/mathematics/high-school/ndpp0bj4622vqk770z76bt74yddkpn0i4y.png)
. Hope this has helped you understand and have a great day!