Elements of astronomy ... with explanatory notes, and questions for examination (1855)
Brocklesby, John, 1811-1889 · New York, Farmer, Brace & co. · leaf 27
ANGLE. 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 rectilinear triangle is onethat contains one right angle.… … SIMILAR TRIANGLES. the other, each to each, and the sides forming the equal an.gles proportional; thus, in Figs, 6 and 7, the triangles 1. Rectilinear, from rectus, straight, and linea, a line, (Latin,) straight LINED. What is a triangle ? How many degrees does it contain 1 Refer to figure, What…
Astronomy
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
