March 2013

03.03.13 - radii of touching circles

radii of touching circles

When the sum of the radii and the distance between the centres are equal, the circles touch externally. If the difference between the radii and the distance between the centres are equal, then the circles touch internally.

No Older Posts
No Newer Posts

  • Categories

  • Archives

  • FOTO FACTS

    Motor drive is an automatic film wind : on mechanism which can be attached to some cameras. While the shutter remains depressed the film will keep winding on after exposure.

  • Deoxyribonucleic Acid [DNA]

    Deoxyribonucleic acid is a molecule that encodes the genetic instructions used in the development and functioning of all known living organisms and many viruses. DNA and RNA are nucleic acids; alongside proteins, they compose the three major macromolecules essential for all known forms of life.