Model of a Rectangle Bisected into Two Right Triangles, Ross Surface Form #8

This is the eighth 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 bisected along a diagonal. A paper label pasted to the model reads: Oblong 4x6 Bisected. According to Ross, this model demonstrates that a right-angled triangle with unequal sides adjacent to the right angle has half the area of a rectangle.
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 10 cm; 13/32 in x 5 29/32 in x 3 15/16 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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