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Which area tiles are present in the visual model of a square with side a+b?

Answer and explanation

Correct answer: One a² square, one b² square and two ab rectangles

The correct answer is B. Draw a square with side a+b and divide each side into parts a and b. The a-by-a corner forms one square of area a². The b-by-b corner forms one square of area b². The two remaining parts have dimensions a by b and b by a; each has area ab, so together they are two ab rectangles. The full area is therefore a²+ab+ab+b²=a²+2ab+b². Option A misses one cross-rectangle. Option C has two a² squares even though there is only one a-by-a region. Option D incorrectly counts two b² squares. Memory cue: in (a+b)², the two middle pieces are equal rectangles, which is why the middle term is 2ab.

Related tags

Visual ModelPerfect Square IdentityArea TilesBinomial SquareVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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