Babbit, Arthur B · New York, H. Holt and company · leaf 184
FiG. 86 GEOMETRICAL DEFINITIONS 173 … Fig. 87 The arc cumference. Line A B, Fig. 87, is a radius. All the radii of a circle are equal. The diameter of a circle is a straight line drawn through the center and ^ joining two points in the circumference. Line C D, Fig. 87, is a diameter. A diameter is equal to two radii. An arc of a circle…
Mechanical drawing
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