Question
Download Solution PDFWhich of the following statements are correct In chain/tape surveying, the 3-4-5 method can be used:
i. to setout contour line
ii. to draw a perpendicular line to the chain line,
iii. to draw a perpendicular offset,
iv. to remove the obstacle to ranging.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDF3-4-5 Method in Chain/Tape Surveying:
The 3-4-5 method is a practical application of the Pythagorean theorem used in chain/tape surveying to establish right angles. This method is straightforward and commonly used in field surveying due to its simplicity and accuracy.
Explanation of Correct Statements:
- Statement ii: To draw a perpendicular line to the chain line
- The 3-4-5 method is frequently used to draw a perpendicular line to a chain line. By creating a triangle with sides of 3, 4, and 5 units, the angle opposite the side measuring 5 units is a right angle, ensuring the perpendicularity of the line.
- Statement iii: To draw a perpendicular offset
- The 3-4-5 method can also be used to draw a perpendicular offset from a baseline. This is particularly useful when establishing reference points or features that need to be perpendicular to a given line.
Last updated on May 28, 2025
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