Tangency 01

How to draw a line tangency to a circle.

- Draw a line from point P to the

centre of the circle, R.

- Draw an arc through point P and R.

- N is the point of tangency.

- Draw line PN.

Tangency 02

How to draw a line tangency to two circle.

- Draw line between two center.
- Draw arc through these center.
- Draw circle with R59-R39 to intersect
the arc at D.
- Draw line AD and project until E.
- Draw parallel line AE and BF.
- EF is line of tangency between two
circle.

Tangency 03

How to draw a line internally tangency between two circles.

- Draw an arc through center of two circle.
- Draw another arc with radius of R59 plus R39 and intersect at D.
- Draw line AD.
- E and F are the point of tangency.

Tangency 04

How to draw an arc in touch internally and through a given point

1. Draw line PR and bisect it.
2. Draw straight line RO to intersect at S.
3. Centered at S, draw an arc through P and R.

Tangency 05

How to draw an arc in touch externally and touch through a given point

1. Draw a perpendicular line PR,
2. Draw a parallel line OA,
3. Draw line AP intersecting at K,
4. Draw line OK intersecting at S,
5. Centered at S, draw arc through P and K.