Sharp EL-5230 User Manual download pdf (Page 91)

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 ;

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 ;

If (B+C)<=A Goto ERROR i 8 ( ; B + ; C

) i E ; A ; s

i 9 @ a ERROR ;

If (C+A)<=B Goto ERROR i 8 ( ; C + ; A

) i E ; B ; s

i 9 @ a ERROR ;

; B + ; C ) z 2

S = √ T (T – A) (T – B) (T – C)

T = —————

A + B + C

Chapter 8: Application Examples

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Sharp EL-5230 User Manual Page 91