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While dimensioning a sphere, what should be added in front of the dimension figure?

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While dimensioning a sphere, what should be added in front of the dimension figure?

(a) Sp

(b) Sq

(c) SPHERE

(d) φ

I have been asked this question in a national level competition.

My enquiry is from Terminology of Dimensioning topic in section Lines, Lettering and Dimensioning of Engineering Drawing

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Right option is (c) SPHERE

Best explanation: Since in all views, a sphere is seen as a circle. While dimensioning a sphere it is important to add ‘SPHERE’ in front of the dimension figure giving information about the diameter of the sphere. For example, a sphere with 25mm diameter will be dimensioned as ‘SPHERE 25’.

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