Computing Areas Of Regular N-Sided Polygons - Texas Instruments TI-84 Plus Manual Book

Computing Areas of Regular N-Sided Polygons

Problem
Use the equation solver to store a formula for the area of a regular
N-sided polygon, and then solve for each variable, given the other
variables. Explore the fact that the limiting case is the area of a circle, pr
Consider the formula A = NB
polygon with N sides of equal length and B distance from the center to a
vertex.
N = 4 sides
Procedure
Press 
1.
equation editor or the interactive solver editor is displayed. If the
interactive solver editor is displayed, press } to display the equation
editor.
2. Enter the formula as
Í. The interactive solver editor is displayed.
3. Enter and
N=4
( ) from center to vertex of 6 centimeters.
B
Press } } to move the cursor onto
4.
The solution for
90
2
sin(pàN) cos(pàN) for the area of a regular
N = 8 sides
to select
0 0:Solver
N
0=A NB
to find the area (
B=6
is displayed on the interactive solver editor.
A
N = 12 sides
from the
MATH
2
p p
sin( / N)cos(
) of a square with a distance
A
, and then press ă \.
A
menu. Either the
, and then press
/ N)
Activities
2
.