hp calculators
HP 30S Converting Angles and Times
The entry line contains 25º. When this is evaluated by the ykey, the HP 30S will convert 25º into the
current angle unit, i.e. radians.
Answer: 0.436332313 radians.
Example 2: Convert 25º into grads.
Solution: First of all, we have to set the angle mode to the unit into which we want to convert, i.e. grads. Press
c@y (assuming RAD was the current mode)
Note that the entry line now contains 25º again—the last calculation entered or the one being edited— so
we just have to press y to do the conversion.
Answer: 27.77777778 grads or
9
7
27
grads (press —Iy to express the result as a mixed number).
Example 3: Convert an angle of
3
2π
radians into decimal degrees.
Solution: Since the target unit is degrees, set the angle mode to degrees by pressing: c@y. The entry line
still contains 25º from previous examples. Press o to clear it. Now enter
32π
and add a small r from
the DMS menu to indicate that this quantity is expressed in radians:
r2x/3s—A@@@y
The entry line now reads
r
)( 32π
. Parentheses are necessary because the º, ‘, ‘’, and functions take
precedence over the division function. Press yand the result line will contain the same value but
expressed in decimal degrees.
r g
Answer: 120º
Example 4: Add 120º to and express the result in both decimal degrees and in the DMS format.
r
.14
Solution: 120º is already stored in ANS from the previous example, so press:
+4.1—A@@@yy
It returns the sum expressed in decimal degrees. To express this number in the DMS format, use the
DMS function of the DMS menu. You need not reenter its argument, since it is taken from the ANS
register, simply press:
—A<yy
Answer: 354.912696 or 354º 54’ 46’’
hp calculators - 3 - HP 30S Converting Angles and Times - Version 1.0
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