9
Basic Keyboard/ALGEBRA USING THE SHARP EL-9900
Copyright © 2002, Sharp Electronics Corporation. Permission is granted to photocopy for educational use only.
1. Press 2ndF QUIT CL to return to and clear the calculation screen.
2. To evaluate the formula for the area of a trapezoid (Area=(h/2)(a+b), where
‘h’ is the height between the two bases (‘a’ and ‘b’) for different values, you
must first type in the formula. For example, to enter the area formula for a
trapezoid, press
(
ALPHA H ÷ 2
)(
ALPHA A +
ALPHA B
)
ENTER .
3. Now, store the values for ‘h,’ ‘a,’ and ‘b’ into the calculator. Use h=1, a=2,
and b=3. Store these by pressing 1 STO ALPHA H ENTER 2
STO ALPHA A ENTER 3 STO ALPHA B ENTER .
4. Clear the screen by pressing CL . Recall the formula by pressing 2ndF
ENTRY four times. Press ENTER to evaluate the formula for the stored
values.
5. Change the height to 4 by pressing 4 STO ALPHA H ENTER .
Recall the formula by pressing 2ndF ENTRY two times and press
ENTER to re-evaluate the formula for the new value.
FORMULAS
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