👉 In mathematics, congruence is a concept that relates two numbers or expressions. It means they are in the same position or size in relation to each other. For example, 3 and 7 are congruent because their positions are the same apart from being multiplied by 2. The term "congruity" can be used to describe situations where two mathematical objects have the same value or representation. It can also refer to the relationship between two numbers that is based on their size or position
