# USING THE 3-4-5 - PowerPoint PPT Presentation

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USING THE 3-4-5. TIM CASSELL MGF 1107 PROFESSOR LEO LUSK. WHAT IS THE 3-4-5?. It is a process that most people in the construction industry use to check for “square”. It is a simple form of the Pythagorean Theorem. HOW DO YOU USE THE IT?.

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USING THE 3-4-5

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## USING THE 3-4-5

TIM CASSELL

MGF 1107

PROFESSOR LEO LUSK

### WHAT IS THE 3-4-5?

• It is a process that most people in the construction industry use to check for “square”.

• It is a simple form of the Pythagorean Theorem

### HOW DO YOU USE THE IT?

• From the corner of a square or rectangle you measure in both directions.

• One direction you measure three feet and make a small, accurate mark.

• The other direction you measure four feet and make another small mark.

• Now measure the distance between the two marks you made. If it is square, it will read exactly five feet.

### WHAT CAN YOU USE IT FOR?

• It can be used to make sure a deck you are building is square to the house.

• If you are pouring concrete and need to make sure the forms are right you can use this formula.

• You can even check existing work for errors.

### WHAT IF I GET 3-4-5 1/2?

• If the last measurement you make(the five foot one) is not right, you can adjust it by moving the wall (or whatever) until the five foot mark is reached.