Sullivan, Christine [Gordon]. [from old catalog] · New York, Cincinnati [etc.] American book company · leaf 13
Fig. 6.— Parallel Lines. DEFINITIONS. ANGLES. 8. An angle is the amount of divergence between two lines thatmeet in any plane. 9. An angle is designated by naming its sides,or by naming the vertex only. 10. There are three kinds of angles. 11. A right angle is formed by one straight linemeeting…
Mechanical drawing
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