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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
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of Edward Shore, 2017.