A natural philosophy : embracing the most recent discoveries in the various branches of physics, and exhibiting the application of scientific principles in everyday life .. (1899)
Quackenbos, G. P. (George Payn), 1826-1881 · New York, Cincinnati [etc.], American book company · leaf 40
; as, F E D in Fig. 19. 15. An Acute Angle is one that is less than a right angle;as, F E C in Fig. 19. 16. A Triangle is a figure bounded by three straightlines; as, A B C, Fig. 20. 17. A Quadrilateral is a figure bounded by four straightlines; as, ABC D, Fig. 21. 18. A Diagonal of a quadrilateral… … Fig. 21.
Physics
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