Assertion: square's length | /r/HasProperty | 18 inches
Facets:
Source sentences:
text: Its name comes from its resemblance to the letter T. T-squares come in varying sizes, common lengths being 18 inches (460 mm), 24 inches (610 mm), 30 inches (760 mm), 36 inches (910 mm) and 42 inches (1,100 mm).[citation needed]