Sharp el-9950 - Page 39

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Chapter 2: Operating the Graphing Calculator
7 ! Returnsafactorial.
Example
• 
Calculate6
×
5
×
4
×
3
×
2
×
1.
6
M
C
7 E
D CONV
These tools deal with conversions between different angle units and
between rectangular and polar coordinates.
  The“base60”sexagesimalsystem,aswellastheminutes-second
measurementsystem,wasinventedbytheSumerians,wholived
intheMesopotamiaareaaroundthefourthmillenniumB.C.(!)The
notion of a 360 degrees system to measure angles was introduced
totheworldbyHipparchus(555-514B.C.)andPtolemy(2ndcent.
A.D.),about5000yearslater.Westillusetheseancientsystems
today, and this calculator supports both formats.
1
→
deg Takes a number in sexagesimal form, and converts it into a decimal
number. To enter a number in sexagesimal form, use items in the
“ANGLE”sub-menu,describedasdescribedinChapter3.
Example
• 
Convert34°56’78”todegrees.
3 4
M
E
1
5
6
M 2
7 8
M
3 M
D
1
E
2
→
dms Takes a number in decimal form (in degrees), and converts it into a
sexagesimal number.
Example
• 
Show40.0268degreesin
degrees, minutes, and seconds.
40.0268
M
D
2
E
Sexagesimal
and Degree
System