Sharp EL-9900 - Manual (Page 4)

2
Basic Keyboard/GENERAL MATHEMATICS USING THE SHARP EL-9900
Copyright © 2002, Sharp Electronics Corporation. Permission is granted to photocopy for educational use only.
Press to access the calculation screen.
A trapezoid is a four-sided figure where two of the sides are parallel
and the other two sides are not parallel.
The area of a trapezoid is defined to be Area = ( )•(b
1
+ b
2
) where h
is the height or distance between the parallel sides b
1
and b
2
.
1. Calculate ( ) × (3 + 4).
STEP 1: Enter ( ) by pressing ( 5 a/b 2 ) .
STEP 2: Multiply by pressing the
× key.
STEP 3: Enter (3 + 4) by pressing ( 3 + 4 ) .
STEP 4: Calculate by pressing the ENTER key.
The answer is 17.5
2. Edit the previous calculation to find ( )•(7 + 4).
STEP 1: Edit the previous calculation by pressing 2ndF ENTRY
to move the blinking cursor to highlight the 3.
STEP 2: Delete the 3 by pressing DEL to backspace delete.
STEP 3: Insert the 7 by pressing 7 .
STEP 4: Calculate by pressing the ENTER key.
The answer is 27.5.
PARENTHESES AND EDITING
Ч
+ –
ч
h
2
5
2
5
2
5
2
▼
▼
▼ ▼
h
b
1
b
2
▼