Windstream
Ojk's Precalculus Study Page: Geometric Representation of Complex Numbers
An introduction to viewing the complex plane in terms of polar coordinates. Assumes knowledge of the conversion formulas. Includes several examples and pictures.
University of Regina (Canada)
University of Regina: Math Central: Why Are Satellite Dishes Parabolic?
This site explains why satellite dishes are parabolic.
Wikimedia
Wikipedia: Centripetal Force
Wikipedia's site on centripetal force provides a section explaining the difference between centripetal force and centrifugal force. Includes formulas and hyperlinked terms.
University of Cambridge
University of Cambridge: Maths and Sports: Angle of Shot
At what angle should you release the shot to break Olympic records? This activity gives students the opportunity to investigate projectile motion in a real-life context, and is aimed at A-level students (grades 10, 11, and 12).
University of St. Andrews (UK)
University of St. Andrews: Cissoid of Diocles
Detailed and comprehensive site explaining the Cissoid of Diocles. A Java-enhanced interactive is included.
Khan Academy
Khan Academy: Angle of Complex Numbers
Given a complex number of the form a+bi, find its angle. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Alabama Learning Exchange
Alex: Conic Sections: Playing With Hyperbolas
Through a mixture of online exploration, and teacher instruction, students will discover how Hyberbolas are formed and will be able to use the key components (center, vertices and the asymptotes) to generate the equation of a graph.
National Council of Teachers of Mathematics
Nctm: Illuminations: Robot Sketcher
Explore this awesome tool that animates a robot that contains sliding arms (like those used in hydraulics) and rotating arms like those used in rotary motors. The exploration asks students to consider how to find the area drawn by the...
Concord Consortium
The Concord Consortium: Molecular Workbench: Hypocycloid
View a hypocycloid being created in this simulation.
Math Words
Math words.com: Foci of an Ellipse
The definition for foci for an ellipse is given and the definition for ellipse is given. Also gives a diagram and the equation for an ellipse in standard form.
Wolfram Research
Wolfram Math World: Circle
This site from Mathworld provides a wealth of information about circles is presented. The information ranges from the basics--radius, circumference, etc.--to advanced concepts--equations in polar and pedal coordinates, etc.
Wolfram Research
Wolfram Math World: Folium of Descartes
This site gives the parametric, cartesian, and polar equations for this plane curve. Also given is the point of discontinuity, equation for the asymptote, and area under the curve.
Curated OER
Circle Picture
This site provides definitions for different parts of a circle, pictures to more clearly represent formulas involving circles. Some of the formulas discussed include: area of a circle, area of a sector of a cirles, circumference, length...
Curated OER
Parametric Unit Circle
This site provides definitions for different parts of a circle, pictures to more clearly represent formulas involving circles. Some of the formulas discussed include: area of a circle, area of a sector of a cirles, circumference, length...
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