Sharp EL-9900 - Manual (Page 76)

66
Chapter 5
Advanced Calculations —
Advanced Keyboard
Note: To try the examples in the chapter, it is required that the Advanced Keyboard is
already set up by the user. To learn how to set up the Advanced Keyboard, read
“Changing the Keyboard” in Chapter 1.
1. Try it!
The Mendocino Tree, a coast redwood growing in Montgomery Woods State
Reserve in California, 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
and the bottom of the tree 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 on the
Advanced keyboard to enter/perform the calculation.