• • • ##### Device
• TI-Nspire™
• TI-Nspire™ CAS
• TI-Nspire™ CX/CX II
• TI-Nspire™ CX CAS/CX II CAS
• TI-Nspire™ Navigator™
• ##### Software

TI-Nspire™
TI-Nspire™ CAS

3.9

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Precalculus: Polar Coordinates
by Texas Instruments

#### Objectives

• Students will develop a basic understanding of the polar coordinate system and locate points given in polar form.
• Students will convert points between polar and rectangular coordinates.
• Students will sketch graphs of polar equations.

#### Vocabulary

• polar coordinates
• pole
• polar axis
• absolute value
• argument
• rectangular coordinates

#### About the Lesson

This lesson involves a brief introduction to the polar coordinate system.
As a result, students will:

• Determine the location (quadrant) of various points given in polar form.
• Recognize cases in which a point lies on an axis.
• Convert points between polar and rectangular form.
• Discover that the polar coordinates for a point are not unique.
• Sketch the graphs of polar equations.
• Use their calculators to check graphs sketched using paper and pencil.