Sharp EL-5230 - Manual (Page 91)

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