Wednesday, March 22, 2017

HP 15C: Regular Polygon: Internal Angle, Area, Perimeter



Hope you all like the new background and style changes!  Thank you for the success of this blog - less than a month to the blog's sixth birthday (4/11/2017).  


HP 15C:  Regular Polygon: Internal Angle, Area, Perimeter

Inputs (Store values before running the program):
R0:  n, number of sides
R1:  s, length of each side

Outputs:
R2:  θ, Internal Angle
R3:  A, Area
R4:  P, Perimeter

Formulas Used (Degrees Mode Used):

Internal Angle:  θ = 180° - 360°/n
Area:  A = (s^2 * n)/(4 * tan (180°/n))
Perimeter:  P = s * n

Step
Key
Code
001
LBL C
42, 21, 13
002
DEG
43, 7
003
1
1
004
8
8
005
0
0
006
ENTER
36
007
ENTER
36
008
2
2
009
*
20
010
RCL÷ 0
45, 10, 0
011
-
30
012
STO 2
44, 2
013
R/S
31
014
RCL 1
45, 1
015
X^2
43, 11
016
RCL* 0
45, 20, 0
017
1
1
018
8
8
019
0
0
020
RCL÷ 0
45, 10, 0
021
TAN
25
022
4
4
023
*
20
024
÷
10
025
STO 3
44, 3
026
R/S
31
027
RCL 0
45, 0
028
RCL* 1
45, 20, 1
029
STO 4
44, 4
030
RTN
43, 32

Example:  R0 = n = 5, R1 = s = 4.  Output:  θ = 108°, A ≈ 27.5276, P = 20

This blog is property of Edward Shore,  2017.

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