To find the area of a triangular garden plot with base = 4 meters and height =
8.35 meters, use ▼ to move the blinking cursor over B and type in 4. Type in
8.35 for H and press ENTER . Press ▲ twice to move the prompt to the A
variable. Press 2ndF EXE to find the area, 16.7 square meters. (You may wish
to save this formula for later recall using the methods described in Chapter 7.)
The second formula for the area of a triangle can be typed in as
A = B•C•sin θ. Press CL three times to return to and delete the current equation.
Type in the equation A = B•C•sin θ with the keystrokes: ALPHA A
ALPHA = a/b 1 2 ALPHA B × ALPHA C × sin
ALPHA θ . Consider the triangle below where sides of lengths 4.8 and 5.73
enclose a 47° angle. The height of this triangle is not known, but you do have
the necessary information to use the formula A = B•C•sin θ.
Area of a Triangle/TRIGONOMETRY USING THE SHARP EL-9600 43
47°
(
4.8
5.73
1
2
1
2
1
2
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