Tangent

As you may or may not know, I'm learning for Math teacher. So, yesterday evening the new "schoolyear" started with a class in Geometry. I've studied applied mathematics in 1991-1993, but never finished the study, in 1993 I switched to computer sciences but I've always been interested in math. However, if you're not working with it for a while, you really tend to forget quite a bit. So this geometry lesson was a good refresher.

The tangent of a circle is always perpendicular to the radius going through that point.

A very nice geometry "drawing" application is Geogebra. It's free, runs on all platforms (java) and is localized in many languages. I created the image below with Geogebra to visualize the above thesis.

Now Playing

Shout! (shout!)
Count on me I'm gonna win The Race
Count on me I'm gonna win The Race
Room-dah-bee-boom the whippering dong
Room-dah-bee-boom the whippering dong

Now shut the door keep down to south
Shut the door keep down to south
Shut the door keep down to south

Not any track is turning but The Race is in my head
I'm attacking the illusion but the stopping drives me mad

Time is running out and the illusion fades away
Time is running out another day is on its way

Another sun was shining and he knew he wasn't great
He didn't ever talk about he knew he couldn't wait

Are you ever gonna push me let me run and let me do
I need it and I'm ready and I haven't got a clue

Not any track is turning but The Race is in my head
I'm attacking the illusion but the stopping drives me mad

Fire away!
This is The Race!

Why?
Burn!
Shout!
Lies!

Give me The Race!

Another sun was shining and he knew he wasn't great
He didn't ever talk about he knew he couldn't wait

I need this race!

Are you ever gonna push me let me run and let me do
I need it and I'm ready and I haven't got a clue

Any track is turning but The Race is in my head
I'm attacking the illusion but the stopping drives me mad

Fire away!

Time is running out and the illusion fades away
Time is running out another day is on its way

This is The Race!

Good afternoon, ladies and gentlemen
This is Billy McKloski from Palm Springs reporting for NBC Sports of
America
Twenty seconds to the start of the thirty-first Formula race on a hot
sunny afternoon here in California

On the fast lane of the street I'm driving
Sometimes, somewhere, I'm arriving
Every day and every night

Why?
I need this race!

Count on me I'm gonna win The Race
Count on me I'm gonna win The Race
Room-dah-bee-boom the whippering dong
Room-dah-bee-boom the whippering dong

Shut the door keep down to south
Shut the door keep down to south
Shut the door keep down to south

Race in my head!

Starmap 1.1 released

New in 1.1:

 

  • Correct Saturn rings orientation and an additional view, closer to the planet.
  • Users can add and store up to 20 locations.
  • Autolocation is improved.
  • Autolocation sets the time zone automatically. The user can modify it anytime.
  • Autolocation at launch.
  • More cities coordinates (200 US and Canadian cities added).
  • Some stars and constellations names corrected.
  • User settings constellation names are now reflected in the ephemeris, only latin today.
  • A double tap on the screen sets the field of view to maximum.
  • A single taps how informations about the couched object.
  • Constellation names are displayed with a lighter color.
  • Sun is drawn larger.
  • Full night vision for the interface (not only the night lamp).
  • The status bar can be hidden.
  • Searching for Moon and Sun.
  • Searching/Locating from the ephemeris planet information.
  • Transit times will be added to the ephemeris.
  • The accelerometer now controls the azimuth.
  • More images if deep field objects.
  • Some corrections related to daylight savings.
  • The ecliptic and celestial equator are drawn with a thinner line.
  • Full localization in Dutch, German, Italian, Japanese, Spanish

 

(click here to go to AppStore)

-- Sent from my iPhone