National Council of Teachers of Mathematics
The Math Forum: Problems Library Geometry Triangles
This site contains a wealth of problems that deal with the basic definitions of medians, altitudes, angle bisectors, and perpendicular bisectors or the defining characteristics of the different types of triangles. There are also...
Oswego City School District
Regents Exam Prep Center: Circles, Segments, and Area
A wealth of resources to supplement instruction on parts of the circle. Find lessons describing chords, tangents, secants, and segments, as well as related practice quizzes and classroom activities.
CK-12 Foundation
Ck 12: Geometry: Circles: Segments and Lengths Study Guide
This study guide on circles covers some vocabulary and theorems about segments and lengths. It is available for download with free registration.
National Institutes of Health
Ninds: Spina Bifida
A general site about Spina Bifida. Includes information on what it is, how it is treated, what the prognosis might be, what research is being done, and more.
National Institutes of Health
Ninds: Spinal Cord Injury Information Page
What is a Spinal Cord injury? What causes it and how can it be treated? Learn all about it here.
Texas Education Agency
Texas Gateway: Using Logical Reasoning to Prove Conjectures About Circles
Given conjectures about circles, the student will use deductive reasoning and counterexamples to prove or disprove the conjectures.
Other
Dr. Brian Blood: Music Theory and History Online
An exhaustive resource with everything concerning music theory. From ear training to music history, this site covers it all.
Other
Diaphragm Description
A post from 'Vocalist' written by Lloyd Hanson, a professor of voice, explaining the diaphragm muscle system.
Varsity Tutors
Varsity Tutors: Hotmath: Practice Problems: Circle Exercises
Twenty-five problems cover various circle activities. They are given with each step to the solution cleverly revealed one at a time. You can work each step of the problem then click the "View Solution" button to check each step of your...
Other
Onco Link: Brain Tumors
This site provides much information on brain tumors. Includes anatomy of central nervous system, types of brain cancer, and symptoms of brain cancer.
Other
Tone Savvy
You will find many free games that will help you develop your music theory knowledge. Learn rhythmic dictation, key signatures and intervals as well as several other topics concerning music theory.
Cuemath
Cuemath: Segment of a Circle
This lesson expands your knowledge about circles by learning about the segment of a circle, which will include its mathematical definition, area of the segment, types of segments in a circle, theorems based on a segment of a circle, and...
Cuemath
Cuemath: Arc Length
Learn all about arc length. This lesson targets what is arc length and the different formulas used to calculate it. Check-out the interactive simulations to know more about the lesson and try your hand at solving a few interesting...
Texas Instruments
Texas Instruments: Constructing the Diameter of a Circle
Given a circle, students will construct a diameter of the circle. They will use the following theorem: In the same circle, if one chord is a perpendicular bisector of another chord, then the first chord is a diameter.
Other
The Essential Guitar Guide
A great resource for guitar players, this site provides a lot of music theory, how to play chords, how to improvise and more. On the download page there is a chord calculator that displays the notes of many chords.
TED Talks
Ted: Ted Ed: The Physics of Playing Guitar
Guitar masters like Jimi Hendrix are capable of bending the physics of waves to their wills, plucking melody from inspiration and vibration. But how do wood, metal, and plastic translate into rhythm, melody, and music? Oscar Fernando...
Other
Socialist worker.org: The Politics of Marcus Garvey
The "back to Africa" ideas of Marcus Garvey struck a chord in early 20th century America and gave rise to a mass Black nationalist movement. Christina Bergmark takes a look at the reasons why.
Mangahigh
Mangahigh: Shape: Isosceles Triangles Inside Circles
Determine isosceles triangles inside a circle made from chords and radii.
Other
I Was Doing All Right: Ear Trainer
An excellent online ear training tool is available at this website. Identify intervals, chords and short melodies.
Wonderville Media
Wonderville: Baboons
Baboons have incredible vocal chords, and they can make more than 30 distinct noises, from short grunting sounds to full-blown screaming. Learn more about Baboons in this well-constructed overview by Wonderville.
Independence Hall Association
U.s. History: The Stamp Act Controversy
Read about why the Stamp Act caused such controversy in the colonies. The British Parliament had imposed several taxes previously, but find out why this one, in particular, struck such a chord.
CK-12 Foundation
Ck 12: Interactive Geometry: 8.4 Inscribed Angles
Learn about inscribed angles formed by two chords in a circle which have a common endpoint.
Other
Online Mallet Lessons
This site contains numerous tips and suggestions dealing with many facets of playing the vibraphone and marimba. Although much of the information is jazz oriented, some is general enough that it could easily be applied to xylophone and...
Math2
Math2: Circles
This site has many useful formulas and examples relating to circles, including related definitions, circumference of a circle, area of a circle, length of a circular arc, area of a circular sector, equation of a circle in cartesian...
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