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A line of length 15 cm is parallel to horizontal plane and makes an angle of 30 degrees with vertical plane. The length of line in top view is ____ cm.

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A line of length 15 cm is parallel to horizontal plane and makes an angle of 30 degrees with vertical plane. The length of line in top view is ____ cm.

(a) 30

(b) 15

(c) 12.9

(d) 7.5

I got this question in an international level competition.

I need to ask this question from Projection of Straight Lines Parallel to Plane in portion Projection of Lines of Engineering Drawing

1 Answer

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Best answer
Right answer is (b) 15

The best explanation: Given the line is parallel to horizontal plane and makes an angle of 30 degrees with vertical plane. The top view gives the actual length of the line because the top view is always the projection of objects on horizontal plane to which the line is parallel.

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