
17 Polar app
The Polar app enables you to explore polar equations. Polar equations are equations in which r—the distance
a point is from the origin: (0,0)—is dened in terms of q, the angle a segment from the point to the origin
makes with the polar axis. Such equations take the form r = f(θ).
Getting started with the Polar app
The Polar app uses the six standard app views. That chapter also describes the menu buttons used in the
Polar app.
Throughout this chapter, we will explore the expression 5πcos(θ/2)cos(θ)
2
.
Opening the Polar app
▲
Press , and then select Polar.
The app opens in Symbolic view.
The graphical and numerical data you see in Plot view and Numeric view are derived from the symbolic
functions dened here.
Dening the function
There are 10 elds for dening polar functions. These are labelled R1(θ) through R9(θ) and R0(θ).
1. Highlight the eld you want to use, either by tapping on it or scrolling to it. If you are entering a new
function, just start typing. If you are editing an existing function, tap and make your changes.
When you have nished dening or changing the function, press .
Getting started with the Polar app 309
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