Do the drawn circles have the same radii or the same center?
Congruent
Practice makes perfect
Let's begin by recalling that concentric circles are coplanar circles that have the same center. Congruent circles, however, have congruent radii. Looking at the given picture, we can see that circular macarons lie next to each other in the box and appear to be the same size.
This means that they are congruent, as they have the same radii and they are not concentric.
Extra
Congruent and Concentric Circles
Let's review what we know about concentric and congruent circles. We will begin with the concentric circles.
Concentric Circles
Coplanar circles and have the same center.
Notice that the only thing that differs two concentric circles from each other are their radii. This means that they can be of different sizes as long as their center is the same. Let's take a look at an example.
Circles A and B are concentric circles, they have the same center, O. The area between two concentric circles is called annulus.
Next, let's recall the definition of congruent circles.
Congruent Circles
Circles that have congruent radii.
Let's take a look at an example.
Circles A and B are congruent, they have the same radii.
