Dissection of a Parallelogram into Triangles, Ross Surface Form #9
- Description
- This is the ninth 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 wooden parallelogram (rhomboid in Ross’s terminology) is bisected along a diagonal into two scalene triangles. A paper label attached to the model reads: Rhomboid A 4x6 Bisected. According to Ross, the model shows that if a rhomboid (parallelogram) is cut diagonally through the opposite acute angles, two equal obtuse-angled triangles result.
- Compare models 1985.0112.190 through 1985.0112.202. For further information about Ross models, including references, see 1985.0112.191.
- Location
- Currently not on view
- date made
- ca 1895
- maker
- Ross, W. W.
- place made
- United States: Ohio, Fremont
- Physical Description
- wood (overall material)
- Measurements
- overall: 1 cm x 20 cm x 15 cm; 13/32 in x 7 7/8 in x 5 29/32 in
- ID Number
- 1985.0112.197
- catalog number
- 1985.0112.197
- accession number
- 1985.0112
- Credit Line
- Gift of Wesleyan University
- subject
- Mathematics
- See more items in
- Medicine and Science: Mathematics
- Science & Mathematics
- Arithmetic Teaching
- Data Source
- National Museum of American History
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