Points, lines, circles, and arcs In this lecture we focus on geometric construction techniques that are needed to do manual drafting assignments.  Dividing a line into equal parts (4.5.2)

Points, lines, circles, and arcs (cont.)  Constructing arcs tangent to two lines (4.5.3)

Points, lines, circles, and arcs (cont.)  Constructing an arc tangent to a line and another arc

Points, lines, circles, and arcs (cont.)  Constructing an arc tangent to two given arcs or circles

Points, lines, circles, and arcs (cont.)  Constructing an arc tangent to two given arcs

Points, lines, circles, and arcs (cont.)  Constructing an arc tangent to a given arc

Points, lines, circles, and arcs (cont.)  Constructing lines tangent to two circles o arcs, using a straightedge (a trial and error method)

Conic curves : Ellipses

Conic curves : Ellipses (cont.)