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In which model is an identity explained by only adding areas?

Answer and explanation

Correct answer: Area model

The correct answer is A, the area model. An algebraic identity can be understood geometrically by representing expressions as lengths and products as areas. In an area model, a large rectangle or square is divided into smaller rectangles and squares. The area of the whole figure equals the sum of the areas of all its parts. For example, a square with side \(a+b\) can be divided into areas \(a^2\), \(ab\), \(ab\), and \(b^2\), giving \((a+b)^2=a^2+2ab+b^2\). Option B, the number-line model, mainly represents numbers and their positions or movements, not a sum of rectangular areas. Option C, the clock model, represents time and angles. Option D may explain an idea verbally, but it does not specifically use areas. Memory cue: if the diagram is divided into squares or rectangles and their areas are added, it is an area model.

Related tags

Area ModelVisual IdentityGeometric AlgebraAlgebraic IdentitiesClass 9 MathematicsVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematics

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