This question was asked my my teacher in my class but I was not able to answer so sir please help me.
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Well, Congruency is when two objects are deto same in shape and size.
Eg. Two doors of your house, two books of same class and same subjects,etc.
Similarity is,when two object are same in shape but different in size.
Eg. A circle with radius 3cm and another with 5cm.