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.)