Advanced calculations — advanced keyboard, Chapter 5, Try it – Sharp EL-9900 User Manual

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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.