How to Create a Perfect Right Angle of 90 Degrees (2 methods )

how to get a straight angle of 90 degrees (2 methods)
It is useful for us tilling, building deck, garage, paving, the establishment of accurate playground for badminton, football, ......

The first method is called (3-4-5). this means that create a triangle whose edge lengths are 3,4,5, they may be inches, feet, centimeters, meters.
 measuring the first size is 4,
The second dimension of 3
and the last 5 size, and connection together
The creation of a triangle with a perfect right angles.
It is a ratio which can be extended as much as required, or split up. It is useful for us tilling, building deck, garage, paving, measurement of building foundation, the establishment of precise playground for badminton, football or other...

using the screw on the base of the land can be used for long nails

It even can use the ratio of 3/4/5. This relationship allows us to create a triangle whose edge lengths are 3, 4, and 5. The ratio may increase or decrease
3x2 = 6 / 4x2=8/ 5x2 = 10 They can be centimeters, meters. inches or feet.

2 method:
how to create right angles, if you do not have a straight corner. We can use a pencil, nails, string and a straight board or a spirit level.
It is useful for us tilling, building Deck

tiles How to: youtube.com/watch?v=VV2mj3Alyyw

tile joints and corners: youtube.com/watch?v=9mn7g59AEPQ

how to use tape measurs : youtube.com/watch?v=3k_wcpLsO6s

abot warm floor on woden base and tilings to this floor tiles we start from right angle : youtube.com/watch?v=1-TrFIcxPjU

in this wideo use music from YouTobe Audio Library, "Twin Musicom" "Old Bosa"