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What is the shape of tails and pins in an internal dovetail joint?

(a) Circle

(b) Square

(c) Rectangle

(d) Trapezoidal

I got this question in unit test.

My question is from Determine the Included Angle of an Internal Dovetail topic in chapter Miscellaneous Measurements (EM) of Engineering Metrology

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Right choice is (d) Trapezoidal

To elaborate: The shape of tails and pins in dovetail joint is trapezoidal. A dovetail joint or simply is a joinery technique which is most commonly used in woodworking e.g. furniture, timber framing etc.

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