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A circle has a diameter of (10) centimetres and a larger circle has three times that diameter. What is the diameter of the larger circle?

Answer and explanation

Correct answer: 30 centimetres

The governing concept is proportional scaling: when a dimension is stated as three times another, multiply the original dimension by 3. Thus, larger diameter = 10 × 3 = 30 centimetres. Option C is correct. Twenty is only twice 10, 25 is not a whole-number multiple of 10, and 40 is four times 10. The radius is not required because the question asks for diameter.

Related tags

ProportionDiameterScale FactorMeasurementPrinciples Of ArtArt EducationClass 9 Mcq

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