Texas Instruments -84 Plus, Manual Book

Page: 510 / 696

Chapter 17: Activities 507
3. Enter
N=4
and
B=6
to find the area (
A
) of a square with a distance (
B
) from center to
vertex of 6 centimeters.
4. Press
} }
to move the cursor onto
A
, and then press
ă \
. The solution for
A
is displayed on the interactive solver editor.
5. Now solve for
B
for a given area with various number of sides. Enter
A=200
and
N=6
.
To find the distance
B
, move the cursor onto
B
, and then press
ƒ \
.
6. Enter
N=8
. To find the distance
B
, move the cursor onto
B
, and then press
ƒ
\
. Find
B
for
N=9
, and then for
N=10
.
Find the area given
B=6
, and
N=10
,
100
,
150
,
1000
, and
10000
. Compare your results with
p
6
2
(the area of a circle with radius 6), which is approximately 113.097.
7. Enter
B=6
. To find the area
A
, move the cursor onto
A
, and then press
ƒ \
.
Find
A
for
N=10
, then
N=100
, then
N=150
, then
N=1000
, and finally
N=10000
. Notice
that as
N
gets large, the area
A
approaches
p
B
2
.