Category Archives: Trigonometry

Video lesson: Degrees-minutes-seconds on the TI-84+

If you’re a student of geometry or trigonometry, you’ve probably come across problems involving degrees, minutes, and seconds.  This is an alternative to measuring in decimal degrees, and it works a lot like time.

The conversion rates are:
  • 1 degree = 60 minutes
  • 1 minute = 60 seconds.
As a result, 1 degree = 3,600 seconds.

If you want to convert from degrees, minutes, seconds to decimal degrees, you can divide by 60 and 3600 for minutes and seconds respectively.  In reverse, you would multiply.  The whole conversion process can get time consuming, especially in a testing situation, which is why it’s good to know how to use your graphing calculator.

This video will walk you through the degrees, minutes, and seconds features of the TI-84+.