(15C) Regular Polygons
03-23-2017, 02:53 AM (This post was last modified: 03-23-2017 03:08 AM by Eddie W. Shore.)
Post: #1
 Eddie W. Shore Senior Member Posts: 1,039 Joined: Dec 2013
(15C) Regular Polygons
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
Code:
 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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