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If 11² is viewed using the area model of (10+1)², what is the total area of the two rectangles?

Answer and explanation

Correct answer: 20

The correct answer is A, 20. In the area model for (10+1)², the large square is divided into one square of area 10², one small square of area 1², and two equal rectangular regions. Each rectangle has length 10 and breadth 1, so the area of one rectangle is 10 × 1 = 10. Since there are two such rectangles, their combined area is 10 + 10 = 20, or 2 × 10 × 1 = 20. Thus, the identity is (10+1)² = 10² + 2(10)(1) + 1². Option B is only the area of one rectangle, not both. Option C is the area of the small 1-by-1 square. Option D is the area of the large 10-by-10 square. Memory cue: the middle term 2ab always comes from two equal rectangles.

Related tags

Algebraic IdentitiesArea ModelVisual ModelsMiddle TermVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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