Which instrument is used to render a circle or arc with a variable diameter on a drawing?

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Multiple Choice

Which instrument is used to render a circle or arc with a variable diameter on a drawing?

Explanation:
A compass is the instrument used to render a circle or arc with a variable diameter on a drawing. It has two legs: a fixed pivot point and a pencil or lead on the other leg. By changing the distance between the legs, you set the radius, and then you sweep around the pivot to draw a circle of the desired size. This adjustable radius is what allows circles of different diameters to be drawn. The protractor is for angles, the ruler is a straight-edge for measurements, and the level checks horizontal/vertical alignment, none of which create circles with variable sizes.

A compass is the instrument used to render a circle or arc with a variable diameter on a drawing. It has two legs: a fixed pivot point and a pencil or lead on the other leg. By changing the distance between the legs, you set the radius, and then you sweep around the pivot to draw a circle of the desired size. This adjustable radius is what allows circles of different diameters to be drawn. The protractor is for angles, the ruler is a straight-edge for measurements, and the level checks horizontal/vertical alignment, none of which create circles with variable sizes.

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