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CHAPTER 1
Find the area of the right-angle triangle given below, expressing your
Example 7
answer correct to 5 significant figures.
OPERATION
1 . After entering COMP mode, evaluate the area by using the formula
MODE
1
-1
2
x
X
6
X
9
2 . Now to express answer correct to 5 significant figures, choose 5 to specify the number of
significant figures.
MODE
MODE
MODE
Note that this is not the final answer. Since the power of the 10 after 3.4169 is 1, we move
the decimal point one place to the right to obtain the required answer, i.e. 34.169cm.
Example 8
Calculate
OPERATION
1 . While in COMP mode, press
-1
4
x
+
-1
6
x
)
2 . To store the value into A , simply press
STO
SHIFT
(–)
RCL
Try to think of other ways to key in the expression in Example 8.
Let's Get Started
7
•
3
•
2
9
2
5
1
1
+
and store this value into variable A ..
1
1
4
−
5
6
-1
5
x
(
=
-1
x
A
9.29cm
7.356cm
×
base ×
1
2
5
-1
2
X 7.356 X 9.29
=
-1
2
X 7.356 X 9.29
3.4169
–
-1
-1
-1
4
+(5
-6
-1
-1
-1
4
+(5
-6
height
.
D
0
34.16862
01
fi
10
-1
)
30.25
-1
„ A
)
30.25
4
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