89
The Heron Formula
Obtaining the area S of triangle with side
lengths of A, B and C using the Heron
Formula which is true for any plane triangle.
1.
Press
b
2
1
0
to open a
window for creating a NEW program.
2.
Type HERON for the program title then
press
e
.
• A NEW program called ‘HERON’ will be
created.
3.
Enter the program as follows.
Program code
Key operations
Label START
i
6
@
a
START
;
e
Print”SIDE LENGTHS
i
1
@
a
SIDE
s
LENGTHS
;
e
Input A
i
2
;
A
e
Input B
i
2
;
B
e
Input C
i
2
;
C
e
If (A+B)<=C Goto ERROR
i
8
(
;
A
+
;
B
)
i
E
;
C
;
s
i
9
@
a
ERROR
;
e
If (B+C)<=A Goto ERROR
i
8
(
;
B
+
;
C
)
i
E
;
A
;
s
i
9
@
a
ERROR
;
e
If (C+A)<=B Goto ERROR
i
8
(
;
C
+
;
A
)
i
E
;
B
;
s
i
9
@
a
ERROR
;
e
T=(A+B+C)©2
;
T
;
=
(
;
A
+
;
B
+
;
C
)
z
2
e
S =
√
T (T – A) (T – B) (T – C)
T = —————
A + B + C
2
A
B
C
S
Chapter 8: Application Examples
Summary of Contents for EL-5230
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