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In the visual expansion of a square with side (a+b+c), which rectangle terms appear along with a², b² and c²?

Answer and explanation

Correct answer: 2ab + 2bc + 2ca

Direct answer: Option B, 2ab+2bc+2ca, is correct. Divide each side of the large square into lengths a, b and c. The three square regions have areas a², b² and c². Each pair of different lengths creates two matching rectangles: two rectangles of area ab, two of area bc, and two of area ca. Adding every region gives (a+b+c)²=a²+b²+c²+2ab+2bc+2ca. Option A counts only one rectangle for each pair and misses its matching partner. Option C is the side length, not the sum of region areas. Option D is a product of three variables and does not represent any rectangular region in this two-dimensional model. Cue: every pair appears twice because the area model has a rectangle above and below the corresponding diagonal arrangement.

Related tags

Three-Part SquareVisual ExpansionAlgebraic IdentitiesArea ModelVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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