Model of a Dissected Trapezoid, Ross Surface Form #6

This is the sixth in a series of models of plane figures (surface forms) designed by William Wallace Ross, a school superintendent and mathematics teacher in Fremont, Ohio. The unpainted rectangular wooden model is cut into two pieces at one corner. It may be arranged so that the pieces form either a rectangle or a trapezoid. A paper label attached to the model reads: Dissected Trapezoid 5x7.
Ross argued that the area of the trapezoid equaled half the sum of its parallel sides, multiplied by its breadth.
Compare models 1985.0112.190 through 1985.0112.202. For further information about Ross models, including references, see 1985.0112.191.
Currently not on view
Object Name
geometric model
date made
ca 1895
Ross, W. W.
Physical Description
wood (overall material)
overall: 1 cm x 15 cm x 7.7 cm; 13/32 in x 5 29/32 in x 3 1/32 in
place made
United States: Ohio, Fremont
ID Number
accession number
catalog number
Arithmetic Teaching
Science & Mathematics
See more items in
Medicine and Science: Mathematics
Arithmetic Teaching
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Gift of Wesleyan University
Additional Media

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