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In a square of side (a+b), area partition is used instead of diagonal cutting. Which statement is correct?

Answer and explanation

Correct answer: The two ab rectangles always have equal areas

The direct answer is D. When both sides of a square of side a+b are divided into lengths a and b, the partition contains an a by a square, two a by b rectangles, and a b by b square. Each of the two rectangles has the same pair of side lengths, a and b, so each area is a×b=ab. Their positions may be different, or one may look rotated, but rotation does not change area. A is wrong because the large square has area (a+b)², not 2ab. B is wrong because equal dimensions give equal areas. C is wrong because the small square is b², not ab. The useful cue is: same length and breadth means same rectangle area.

Related tags

Area PartitionEqual RectanglesVisual ProofAlgebraic IdentitiesVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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