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In engineering drawing, which type of arrowhead is used?

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In engineering drawing, which type of arrowhead is used?

(a) Open (90˚)

(b) Small open circle

(c) Closed and filled

(d) Oblique stroke

I got this question in an international level competition.

My doubt is from Terminology of Dimensioning topic in division Lines, Lettering and Dimensioning of Engineering Drawing

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The correct answer is (c) Closed and filled

Easy explanation: Usually in engineering drawing, the arrowheads used are closed and neatly filled. They are made by hand in proportion to the thickness of the outline. The length of the arrowhead is three times the width of the arrowhead.

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