Tamil Nadu Board of Secondary EducationSSLC (English Medium) Class 9

Congruence of Circles




Congruence of Circles:

Observe the circles in the figures above.
Draw similar circles of radii 1 cm, 2 cm, 1 cm, and 1.3 cm on a paper and cut out these circular discs.
Place them one upon the other to find out which ones coincide exactly.

  1. The circles in (a) and (c) coincide.
  2. Circles in fig (b) and (c) and in fig (a) and (d) do not coincide. 
  • Circles which coincide exactly are said to be congruent circles.
  • Circles of equal radii are congruent circles.
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