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If the sides of a rectangle are (a+b) and (c), what two parts appear in the area model?

Answer and explanation

Correct answer: Areas ac and bc

Direct answer: A, areas ac and bc. Split the side a+b into two lengths, a and b, while keeping the other side c unchanged. This divides the original rectangle into an a-by-c rectangle with area ac and a b-by-c rectangle with area bc. Adding them gives the full area c(a+b)=ac+bc, which is the distributive property. B is wrong because ab uses the two pieces of one side and c² does not belong to either resulting rectangle. C would describe two squares, but the model contains rectangles with common side c. D lists side lengths, not areas; area requires multiplication of two lengths. Memory cue: when a sum is multiplied by c, distribute c to each term: c(a+b)=ca+cb.

Related tags

Distributive PropertyRectangle AreaArea ModelVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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