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Activity
Varsity Tutors: Hotmath: Practice Problems: Polar Coordinates Activity
Varsity Tutors

Varsity Tutors: Hotmath: Practice Problems: Polar Coordinates

For Students 9th - 10th Standards
Hotmath provides 20 practice problems relating to polar coordinates and complex numbers. Each of the practice problems include a step-by-step guide for solving.
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Handout
Wolfram Math World: Principal Square Root Handout
Wolfram Research

Wolfram Math World: Principal Square Root

For Students 9th - 10th
MathWorld offers an explanation for the concept of principal square root is found here.
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Activity
The Math Forum: Ask Dr. Math: Why the Principal Square Root Is Positive Activity
National Council of Teachers of Mathematics

The Math Forum: Ask Dr. Math: Why the Principal Square Root Is Positive

For Students 6th - 8th
At this site from Ask Dr. Math at the Drexel University, Dr. Math responds to an inquiry about why the principal square root is positive.
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