GE JS630SFSS Owner's Manual

Chapter 17: Activities

 323

9. Press 

p. Set the viewing window.

10. Press 

o. Turn off all functions and stat plots. Enter the equation for the area. Use 

 in place 

of 

. Set the graph styles as shown.

11. Press 

r. After the graph is plotted, press 

 

Í to trace to 

. Press 

 

Í. 

Press 

 

Í. Notice that as 

 increases, the value of 

 converges to p6

2

, which is 

approximately 113.097. 

p

2

 (the area of the circle) is a horizontal asymptote to 

. The 

area of an N-sided regular polygon, with r as the distance from the center to a vertex, 
approaches the area of a circle with radius r (pr

2

) as N gets large.

You are a loan officer at a mortgage company, and you recently closed on a 30-year home 
mortgage at 8 percent interest with monthly payments of 800. The new home owners want to know 
how much will be applied to the interest and how much will be applied to the principal when they 
make the 240th payment 20 years from now.

1. Press 

z and set the fixed-decimal mode to 

 decimal places. Set the other mode settings 

to the defaults.