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Chapter 3: Manual Calculations
Try it! 2
The Mendocino Tree, a coast redwood growing in Montgomery Woods State
Reserve in California (USA), is known to be the tallest living tree in the world.
You are to find out how tall the tree is by using the following factors:
• The distance from you to the bottom of the
tree is exactly 505.8 feet, and the tree
stands vertically.
• The angle of elevation between the top of
the tree and the observer is 36 degrees.
If the base length of the right triangle is 505.8 feet, and the angle
of elevation is 36 degrees, then the following expression can be
derived:
the height of the Mendocino tree (ft.) = 505.8 ft.
×
tan 36°
CONCEPT
1. Verify/change the calculator’s angle unit.
2. Use the calculator’s trigonometric function key to enter/
perform the calculation.
PROCEDURE
1. Since the angle of elevation is measured in degrees, the
calculator’s angle setting will need
to be matched with that. Press
@
;
to bring up the SETUP
menu.
2. On the right side of the SETUP
menu, the current setup will be
displayed. Make sure that the top
line is indicated as
Deg
(i.e.,
degrees). If not, then the angle
system will need to be changed.
Press
B
to select
B DRG
, then
press
1
to select
1 Deg
.
Содержание EL-9450
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