Sharp EL-5230, EL-5250 operation manual The Heron Formula, A + B + C T =

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.

Chapter 8: Application Examples

AB

S

C

S = √ T (T – A) (T – B) (T – C)

A + B + C T = —————

2

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

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