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A line which is parallel to horizontal plane is made to turn to an angle of 35 degrees with vertical and then turned to an angle of 45 degrees with horizontal plane and now the line has a length of 9 cm from front view. What is its true length?

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A line which is parallel to horizontal plane is made to turn to an angle of 35 degrees with vertical and then turned to an angle of 45 degrees with horizontal plane and now the line has a length of 9 cm from front view. What is its true length?

(a) 7.37 cm

(b) 5.16 cm

(c) 10.9 cm

(d) 15.69 cm

The question was asked in a job interview.

I want to ask this question from True Length of a Straight Line and its Inclinations with the Reference Planes topic in division Projection of Lines of Engineering Drawing

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Correct option is (c) 10.9 cm

Explanation: True length of a line parallel to horizontal plane and making angle with vertical can be of two values either from front view or side view but from top view the length will be given length. As here it is given front view L = 9/cos(35).

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