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If a square of side (a+b) has two equal parts besides the (a²) and (b²) squares, what shape are those parts?

Answer and explanation

Correct answer: Rectangles with sides a and b

The correct answer is A: rectangles with sides a and b. Imagine dividing each side of the large square, whose side is a+b, into two lengths: a and b. The a-by-a corner is a square with area a², and the b-by-b corner is a square with area b². Each of the two remaining regions has one dimension a and the other dimension b. Therefore, each remaining region is an a-by-b rectangle with area ab. Option A is correct because it identifies both dimensions and the shape. Option B is wrong because an a-by-a square has area a² and is already one of the specified squares. Option C is wrong because a b-by-b square has area b² and is also already present. Option D is wrong because a square of side a+b is the entire large figure, not one of the two remaining parts. The two rectangles together contribute 2ab, producing (a+b)²=a²+2ab+b². Memory cue: two equal crosswise pieces in the square model are ab rectangles, not additional squares.

Related tags

Ab RectanglesSquare ModelVisual ProofAlgebraic IdentitiesVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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