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If an original image measures 20 centimetres by 30 centimetres and is enlarged proportionally to twice its size what will be the new dimensions?

Answer and explanation

Correct answer: 40 centimetres by 60 centimetres

The governing concept is proportional enlargement: every linear dimension must be multiplied by the same scale factor. The original dimensions are 20 cm and 30 cm, and doubling means a factor of 2. Thus 20 × 2 = 40 cm and 30 × 2 = 60 cm. Changing only one dimension would distort the image, while the other pairs do not apply the same factor. Therefore option D is correct.

Related tags

ProportionScalingEnlargementDimensionsPrinciples Of ArtArt EducationClass 9 Mcq

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