A treatise on special or elementary geometry (1877)
Olney, Edward, 1827-1887, Olney, Edward, 1827-1887. Elements of trigonometry, plane and spherical · New York : Sheldon · leaf 52
from a piece of paper.Then cut off two of the angles, as 1 and 2, and turnthem about and place them by the side of the otherangle, as in the lower figure. You will then see thatthe line OP is straight, and that the three angles ofthe triangle just make up the two right angles OEDand PED. Ex. 1. If… … o2 ELEMENTARY GEOMETRY. Ex. 3. Can a triangle have more than one obtuse angle ? SuG.—Tiy and see if you can di-aw a triangle -with two right angles, or twoobtuse angles. Ex. 4. Construct any triangle, and drawarcs measuring its angles. Then draw a circlewith the same radius as the one used…
Geometry · Trigonometry
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