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In the area model of a square with side (a+b), which area appears as two congruent rectangles?

Answer and explanation

Correct answer: ab

The correct answer is B: ab. Divide each side of the large square into parts of lengths a and b. The four resulting regions are an a-by-a square, two rectangles, and a b-by-b square. Each of the two rectangles has one side a and the other side b, so each has area a×b=ab. Together, these two rectangles contribute ab+ab=2ab to the identity (a+b)²=a²+2ab+b². Option A is the area of the a-by-a corner square. Option C is the area of the b-by-b corner square. Option D is a length expression, not an area of one of the regions. Therefore B is correct. Be careful about the wording: one rectangle has area ab, while the pair together has total area 2ab.

Related tags

Area ModelCongruent RectanglesBinomial SquareAlgebraic IdentityVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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