Babbit, Arthur B · New York, H. Holt and company · leaf 184
ference. C K D, Fig. 87, is a semicircumference. A chord is a straight hne joining the extremities of an arc. See hne E H, Fig. 87. A tangent is a straightline which touches the cir-cumference of a circle butdoes not intersect it, asM N, Fig. 87. The pointat which the tangenttouches the circle is… … 174 MECHANICAL DRAWING one-half the circle is called a semicircle. See R V T O,Fig. 88. A sector is the area bounded by two radii and thearc which they meet. See Fig. 88. When the radiiare perpendicular, the sector equals one-fourth ofa circle and is called a quadrant. See R 0 V, Fig. 88. Every…
Mechanical drawing
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