# How do I plot parametric and polar curves

How do I "ask" or input a command line for parametric and polar curves with other variables than x such as r, (theta), y etc? thank you

How do I plot parametric and polar curves

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I'm not quite sure what you're asking, but here's how to plot something with a different variable:

```
sage: var('theta')
theta
sage: parametric_plot( (theta, theta^2), (theta,0,10))
```

You just need to declare your variables with `var()`

thank you. thats answears part of my question. I am new to sage and i am not familiar with the command lines (how to tell sage to plot parametric or polar curves). I have plots like x=t-3, y =t^2 + 5 (parametric) and r = 2+ cos((5theta)/2) [Polar] Finally, how I adjust/set a scale so that all my graph shows? How do i tell sage to plot these for me? Thanks.

Asked: **
2011-11-07 09:19:46 -0500
**

Seen: **223 times**

Last updated: **Nov 07 '11**

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