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In a three-part square model, the side is (a+b+c). What is the total area of only the small squares?

Answer and explanation

Correct answer: a²+b²+c²

The direct answer is A: a²+b²+c². Split the side of the large square into three lengths a, b, and c. The visual model then contains three small square regions: one with side a, one with side b, and one with side c. Their areas are a², b², and c² because square area is side×side. Adding only these requested regions gives a²+b²+c². Option B lists the areas of three types of mixed rectangles, not the small squares. Option C gives the doubled mixed terms that appear in the full expansion (a+b+c)², but the question excludes those rectangles. Option D is only the side length, not an area, and it also has the wrong degree. The complete expansion is a²+b²+c²+2ab+2bc+2ca; this helps separate square terms from cross terms. Memory cue: single-part regions produce squares; two-part regions produce products.

Related tags

Three-Term-SquareSmall-SquaresVisual-ModelsVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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