A.) Two circles are congruent if they have the same size. The size can be measured as the radius, diameter or circumference. They can overlap.
Among the given figures, this best describes what congruent circles are,
B.) When two circles touch one another at exactly one point, then we say that the two circles are tangent to one another.
Among the given figures, this best describes what tangent circles are.
C.) Concentric circles are circles with a common center.
Among the given figures, this best describes what concentric circles are,