Brocklesby, John, 1811-1889. [from old catalog] · New York, Sheldon and company · leaf 31
A RECTILINEAR RIGHT-ANGLED TRIANGLE. tres, meaning three. The sum of the three angles of anyrectilinear1 triangle is always equal to 180°. Fig. 4 rep-resents any such triangle, and the sum of its angles isequal to 180° A right-angled rectiliDear triangle is onethat contains one right angle. Thus,… … SIMILAR TRIANGLES. the other, each to each, and the sides forming the equal an.gees proportional; thus, in Figs. 6 and 7, the triangles 1. Rectilinear, from rectus, straight, and linea, a line, (Latin,) straightlined. What is a triangle ? How many degrees does it contain 1 Refer to figure. What iia…
Astronomy
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