Setting out Right angles method by 3-4-5 method

3-4-5 method is commonly used for setting out the right angle by using the tape which gives pretty accurate right angle and is widely used in day to day practice.

 

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Person 1: holds the zero mark & 12m mark of tape

Person 2: holds the 3 meter mark of the tape

Person 3: holds the 8 meter mark of the tape

 

When all the sides are stretched, a triangle is formed and the angle near position or person1 is a right angle.

 

We can either use: 3-4-5 m

Or other multiplies too, depending upon the situation, say

6-8-10 m

9-12-15 m

12-16-20 m