Sharp EL9900C EL-9900C - Page 76
Advanced Calculations, Advanced Keyboard
UPC - 074000016873
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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 CONCEPT 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°) 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. 66