They are congruent circles
Yes. All radii of the same circle have the same length.
Are congruent circles.
Congruent circles
Assume that the two inscribed circles are "side-by-side" and have the same radii of r, then: A= 8 x r x r.
They are congruent circles
concentric circles
Concentric circles are circles with the same common centre.
Yes providing they have the same cicumference
Yes. All radii of the same circle have the same length.
Yes, all radii of a circle have the same length. One often thinks of the radius as being this length.
Circles are congruent when they have the same radius and they are similar when their radii are different in lengths.
Congruent circles
True providing that they have the same diameters
yes
Yes. Congruent circles by definition have the same size, and the radius sufficiently describes the size of a circle.
Are congruent circles.