3. Short answer questions: 1) What is written above a dimension line? 2) What do geometric tolerances describe? 3) Why is scale sometimes used? 4) What do extension lines indicate? 5) Which three elements are necessary for competence in drawings?

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The numerical size or measurement is written above a dimension line.
Geometric tolerances describe the permitted variation in a feature’s form, orientation, location, or runout.
Scale is used to represent an object clearly when its real size is too large or too small for the drawing sheet.
Extension lines indicate the points or features between which a dimension is measured.
The three essential elements are accurate dimensions, knowledge of drawing standards and symbols, and the ability to read and interpret technical drawings.

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