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A square of side (p+q) is divided into four regions. What is the combined area of the two rectangles?

Answer and explanation

Correct answer: 2pq

The correct answer is B: 2pq. The side of the large square is split into lengths p and q in both directions. This creates two rectangular regions whose dimensions are p by q. Using the rectangle-area rule, length × breadth, the area of each rectangle is p×q=pq. Since there are two such rectangles, their combined area is pq+pq=2pq. Option A, p²+q², represents the two square regions, not the rectangles. Option C, pq, gives the area of only one rectangle. Option D, (p+q)², is the area of the entire large square, including all four regions. Memory cue: in (p+q)²=p²+2pq+q², the middle term 2pq comes from two equal p-by-q rectangles.

Related tags

Algebraic IdentitiesVisual ModelsArea ModelRectanglesVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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