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A diagram has two small squares with sides a and b and two equal rectangles. What is the total area?

Answer and explanation

Correct answer: a² + 2ab + b²

Direct answer: B is correct. Add the area of every separate part. The square with side a has area a². The square with side b has area b². Each rectangle has dimensions a and b, so each has area ab. Since there are two equal rectangles, their combined area is 2ab. Therefore, total area = a² + ab + ab + b² = a² + 2ab + b². Option A counts only the two squares and leaves out both rectangles. Option C subtracts one rectangle, although all the pieces are included in the diagram and must be added; it also does not represent the stated arrangement. Option D doubles the square areas but ignores the rectangular areas. A visual-area question is solved by identifying each shape, calculating its area and then adding. Memory cue: two a-by-b rectangles always contribute 2ab.

Related tags

Algebraic IdentitiesVisual ModelsArea ModelBinomial SquareVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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