## 5.5 Examples

It takes some time and practice to feel fully at ease with the different
snapping modes, especially angular snapping. Here are some examples
showing what can be done with angular snapping.

#### Example 1:

We are given segments

*s*_{1},

*s*_{2}, and

*e*, and we want
to add the dashed vertical extensions through

*p* and

*q*.

#### Example 2:

We are given the polygon

*C*, and we want to draw the bracket

*b*, indicating its vertical extension.

#### Example 3:

We want to draw the following "skyline". The only problem is to get

*q* horizontally aligned with

*p*.

#### Example 4:

We want to draw a line through

*p*, tangent to

*C* in

*q*.

#### Example 5:

We want to draw the following "windmill". The angle of the sector and
between sectors should be
30 degrees.

#### Example 6:

We want to draw a

*c*-oriented polygon, where the angles between
successive segments are multiples of
30 degrees.
The automatic angular snapping mode makes this pretty easy, but there is a
little catch: How do we place the ultimate vertex such that it is at the
same time properly aligned to the penultimate and to the very first vertex?