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38
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