How Do You Graph Polar Equations on a TI-89?

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  • Thread starter Thread starter d.tran103
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    Calculator Ti-89
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SUMMARY

The discussion focuses on graphing polar equations using the TI-89 calculator, specifically the equation r = 5 + 5 sin(theta). The user struggles with the correct settings to display the graph, initially set to degrees for the angle. A key recommendation is to switch the angle setting from "Degree" to "Radian" to successfully graph polar equations in the TI-89.

PREREQUISITES
  • Understanding of polar equations and their graphical representation
  • Familiarity with TI-89 calculator settings
  • Knowledge of angle measurement units (degrees vs. radians)
  • Basic graphing skills on calculators
NEXT STEPS
  • Learn how to change settings on the TI-89 for polar graphing
  • Explore additional polar equations and their graphs
  • Study the differences between radians and degrees in trigonometry
  • Investigate other graphing modes available on the TI-89
USEFUL FOR

Students, educators, and anyone using the TI-89 calculator for graphing polar equations, particularly those new to polar coordinates and calculator functionalities.

d.tran103
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Hey, I'm having trouble graphing polar equations in my TI-89. I just bought it and still don't understand how it works. For example I have r = 5 + 5 sin(theta). It's suppose to look like a upside apple thing (kind of). But I don't know how to get the graph to show up. I know I'm doing something wrong with my mode. Here is what my mode is set to:

Graph - Polar
Current Folder - Main
Display Digits - Float G
Angle - Degree
Exponential Format - Normal
Complex Format - Rectangular
Vector Format - Rectangular
Pretty Print - Off

Can someone tell me what I'm doing wrong? Thanks!
 
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d.tran103 said:
Hey, I'm having trouble graphing polar equations in my TI-89. I just bought it and still don't understand how it works. For example I have r = 5 + 5 sin(theta). It's suppose to look like a upside apple thing (kind of). But I don't know how to get the graph to show up. I know I'm doing something wrong with my mode. Here is what my mode is set to:

Graph - Polar
Current Folder - Main
Display Digits - Float G
Angle - Degree
Exponential Format - Normal
Complex Format - Rectangular
Vector Format - Rectangular
Pretty Print - Off

Can someone tell me what I'm doing wrong? Thanks!

Ok, off the bat I'd recommend setting the "angle" to "Radian" for polar mode. Got the same settings on mine pretty much otherwise.
 

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