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When a square of side (a+b+c) is partitioned in a visual model, which area expansion is correct?

Answer and explanation

Correct answer: a²+b²+c²+2ab+2bc+2ca; complete partition

Correct answer: B. The square has side a+b+c, so its area is (a+b+c)². Imagine dividing each side into lengths a, b, and c. The partition contains three smaller squares: a², b², and c². For each pair of different lengths, there are two rectangles: two ab rectangles, two bc rectangles, and two ca rectangles. Therefore the total area is a²+b²+c²+2ab+2bc+2ca. Option A counts only one rectangle for each pair and misses half the area. Option C contains abc, which has three factors and is associated with volume-like multiplication, not a two-dimensional area term. Option D also uses the incorrect abc term and omits the separate pair products. Memory cue: in a three-part square, every pair appears twice; the three square terms appear once.

Related tags

Three-Term SquareVisual ModelArea PartitionAlgebraic IdentityVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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