3-4-5 Squaring

Expected diagonal of a right corner, or scale a 3-4-5 triangle. Optional measured diagonal reports error.

Construction & Trades

Expected diagonal of a right corner, or scale a 3-4-5 triangle. Optional measured diagonal reports error.

App id: GEOM-03. Reference version 1.0.

How to fill it

Fill the inputs. The tool shows the outputs.

On the tool screen, Calc is the working sheet. Presets stores values you reuse. Reference is the formula, assumptions, and provenance below.

Formula

D = √(A² + B²); A,B,D = 3k,4k,5k

Inputs

Name	Unit
Leg A (optional)	`ft`
Leg B (optional)	`ft`
Measured diagonal (optional)	`ft`
Scale k (3k-4k-5k) (optional)	`ft`
Desired diagonal (optional)	`ft`

Outputs

Name	Unit
Expected diagonal (hero result)	`ft`
Leg A	`ft`
Leg B	`ft`
Diagonal error	`in`
Relative error	`%`

Diagnose

Observations are context. They do not pass or fail a structure. See Diagnose.

When	Observation	Severity
`rel > 0.005`	Diagonals do not match	caution

Provenance

Does not declare a layout square. Compare the measured diagonal yourself.