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Program code Key operation
S=‰(T(T-A)(T-B)(T-C)) ; S ; = @ * (
; T ( ; T - ; A
) ( ; T - ; B )
( ; T - ; C ) )
e
Print S i 0 ; S e
End i 5 e
Label ERROR i 6 @ a ERROR ;
e
Print”NO TRIANGLE i 1 @ a NO s
TRIANGLE ; e
Wait 1 i 3 1 e
Print”REENTER i 1 @ a REENTER ;
e
Goto START i 9 @ a START ;
e
Example
Obtain the area of the triangle with the side lengths of 20 cm (A), 35 cm (B)
and 40 cm (C).
4. Press j to return to the PROG mode menu.
5. Press 0, select the program ‘HERON’
and press e.
• If the values you enter do not satisfy the
conditions to make a triangle (e.g. A + B >
C where A, B, C are the side lengths), the program prompts you to re-
enter the values from the beginning. If you wish to stop the program,
press j.
6. Enter 20 for A, 35 for B and 40 for C.
Result
The area of the triangle is approximately 350
cm
2
.
HERON :NORMAL
SIDE LENGTHS
A=?
40
S=
349.944192
Chapter 8: Application Examples