How to Check for Squareness



When it comes to teaching students how to make sure your foundation has a true 90 degree corner to work from, I like to use the simple "3, 4, 5 Rule." This is also known as the Pythagorean Theorem (A^2 +B^2 = C^2). This is truly a great and easy way to assure a square foundation. This is also a good way to reintroduce the basic geometry that they learned in math class. Now they will have a chance to use it in a practial setting or real life.

Lesson time

2 hour block
120 Minutes

Industries / Subjects / Grades

Industries / Pathways
  • Building and Construction Trades Building and Construction Trades
    • Residential and Commercial Construction
    • Mechanical Systems Installation and Repair
    • Cabinetry, Millwork, and Woodworking
    • Engineering and Heavy Construction
Grade Levels
  • 9
  • 10
  • 11
  • 12

Objectives What will they get out of it.


California Math Common Core Standards (1)
Next Generation Science Standards (3)
California's 2008 CTE Standards (1)
California Academic Content Standards (1)

Related Instructional Objectives (SWBAT...)

  • Students will be able to use the Pythagorean theorem in a hands on activity.
  • Students will be able to show how geometry is used out of the classroom in a real world setting.
  • Students will be able to layout a corner using a 3,4,5 method based on a Pythagorean theorem
  • Students will be able to establish a corner using a simple 3,4,5 method.

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