Heron's Formula - Sharp EL-9900 Handbook Vol. 2 Operation Manual

Heron's Formula

Use Heron's formula to find the area of a triangle when the sides (A,B,C) of the
triangle are known.
Calculation
S = D (D - A) (D - B) (D - C)
(A + B + C)
D =
2
FLOWCHART
Start
Entry of sides
Calculation of D
Calculation of area
Display of area
End
Name of parameter
A value of side A
B value of side B
C value of side C
Exercise
Find the area of a triangle when sides A, B and C are 20, 35 and 40cm respectively.
Step
Specify the programme
1
mode.
Select the title HERON.
Enter the values A, B and C.
2
(Display of area)
The area is approximately
3
350cm 2 .
Enter sides A, B and C.
Value of D calculated.
Area S calculated.
Area of triangle
displayed.
PARAMETERS
Content Name of parameter
D
S
Key Operation
A
PRGM
2 0 3
ENTER
4 0
ENTER ENTER
EL-9900 Graphing Calculator
C
A
B
PROGRAMME LIST
Title : HERON
Print "Input LENGTH
Input A
Input B
Input C
(A+B+C)/2 D
(D (D-A) (D-B) (D-C) ) S
Print "S =
Print S
End
Content
value of D
area
5
(REAL MODE)
Display
1