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A rectangle model has sides (x+6) and (x+6). Which special model is it equal to?

Answer and explanation

Correct answer: Square of side (x+6)

The direct answer is B: a square of side (x+6). A rectangle becomes a square when its two side lengths are equal. Here both dimensions are exactly the same, namely x+6. Therefore, the model is a square whose side is x+6, and its area would be (x+6)² if an area were required. Option A is wrong because x+12 is obtained by adding the two side expressions, but the side of a square is not found by adding the rectangle’s sides. Option C changes the plus sign to a minus sign without justification. Option D multiplies x by 6, which is not the given side length. A useful check is to choose x=2: both original sides become 8, so the figure is a square of side 8, not 14, 4, or 12. Memory cue: equal length and width means square.

Related tags

Square-RecognitionRectangle-ModelEqual-SidesVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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