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If (ab) is one rectangle in the (a+b+c) model, what area will (ba) give?

Answer and explanation

Correct answer: Equal to (ab)

The direct answer is option A: ba is equal to ab. In the visual model, an ab rectangle has one side of length a and the other of length b, so its area is a × b = ab. If the orientation is reversed, the same rectangle can be described as having side b first and side a second. Its area is then b × a = ba. Multiplication is commutative, which means changing the order of the factors does not change the product: ab = ba. Option B would be the area of a square with both sides a. Option C would be the area of a square with both sides b. Option D would involve side lengths c and c, not a and b. The two ab-type rectangles in the model may look differently placed, but they have equal areas. Memory cue: turning a rectangle around changes its orientation, not its area.

Related tags

Cross RectanglesCommutative PropertyArea MultiplicationVisual IdentityVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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