How to Check a Square Corner With the Pythagorean Theorem

Pythagoras was a Greek mathematician who was considered to be the first person to describe the relationship between the sides of a right triangle. The Pythagorean Theorem states that in a right triangle, the length of the two sides that make up the right angle can be squared and will equal the squared length of the hypotenuse. You can use this theorem in many different applications to determine if a corner is square.

Ruler or tape measure
Marking device

Instructions

- 1
  Measure 3 units from the corner down one of the sides that makes up the square corner. Use any kind of unit of measure you want, as long as it can be replicated consistently. For example, a unit of measure can be inches or centimeters. Mark the measurement.
- 2
  Use the same unit of measurement to measure 4 units down the other side that makes up the square corner. Mark the measurement.
- 3
  Measure the distance between the two marks creating a triangle with a ruler or tape measure. If the distance is 5 units, the corner is square. If the distance is more or less than 5 units, the corner is not square.

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