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In an area model, what is the main conclusion of writing the area of the same figure in two ways?

Answer and explanation

Correct answer: Both expressions are equal

The correct answer is A. A fixed figure has one fixed area, regardless of how its parts are described. If one calculation writes the area as a sum of smaller regions and another writes it as a product of whole side lengths, both calculations describe the same quantity. Therefore the two algebraic expressions are equal. This is the geometric basis of an algebraic identity. B is wrong because areas are not always negative; ordinary lengths and regions have non-negative area. C is wrong because rearranging or renaming parts does not change the total area. D is meaningless: the figure remains the object being measured. A is correct because equality comes from comparing two descriptions of the same area. Memory cue: same figure, same area, different expression means an identity.

Related tags

Same-AreaVisual-ProofIdentity-ConceptVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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