The American house-carpenter; a treatise on the art of building, and the strength of materials (1867)
Hatfield, R. G. (Robert Griffith), 1815-1879 · New York, J. Wiley · leaf 23
.) 26.—An acute angle is less than a right angle. {Fig- 4.) 27.—An obtuse angle is greater than a right angle. {Fig. 6.) When an angle is denoted by three letters, the middle one, inthe order they stand, denotes the angular point, and the othertwo the sides containing the angle ; thus, let a 6 c,…
Carpentry · Architecture
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Su[m]ma de arithmetica geometria proportioni [et] proportionalita](https://img.insideoutlibrary.com/img/200/ia-summadearithmeti00paci-542-0.webp)
