concentric circles
Concentric circles are circles with the same common centre.
Yes
Circles that have congruent radii. Congruent=coinciding at all points when superimposed (http://dictionary.reference.com/browse/congruent)
Radii is the plural of radius. A radius is the length of a line segment between the center and the circumference of a circle or sphere.
Isn't it the radii?
Concentric circles are circles with the same common centre.
Circles are congruent when they have the same radius and they are similar when their radii are different in lengths.
Congruent circles
They are congruent circles
Are congruent circles.
They are congruent or identical circles
False
Congruent circles
Yes
False
Their circumferences are in direct proportion to their radii. Their areas are in direct proportion to the square of their radii.
Yes, all radii of a given circle have the same length. A circle is defined as all the points on a plane that have a specified distance from a given point, called the center. Any segment from the center to the circle is called a radius (plural radii). Thus, by definition, all such segments (all radii) have the same length.