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In a square with side length (a+2), what is the area of the small corner square?

Answer and explanation

Correct answer: 4

The correct answer is C: 4. In an area model for (a+2)², the side is split into two lengths: a and 2. This creates four parts: an a-by-a square with area a², two rectangles with areas 2a each, and a small 2-by-2 corner square. The question asks only for the small corner square, not for the whole large square. Its side is 2, so its area is 2×2=2²=4. Option A is only the side length 2, not its area. Option B, 2a, describes one of the rectangular parts formed by a length a and a length 2. Option D, a², describes the square whose side is a. Therefore C is the only suitable answer. A useful memory cue is that the constant term in (a+2)² comes from the constant-by-constant corner: 2²=4.

Related tags

Small Corner SquareArea ModelConstant TermBinomial IdentityVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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