Curated OER
Tangents and Circles - Geometry Help
Does watching a person do a math problem help you understand a mathematical concept? If it does then this clip will be a great help. The tutor in this clip completes a geometry problem involving tangents, circles, and the Pythagorean...
Curated OER
Radius, Chord, Diameter, and Secant
What do a secant, chord, diameter, and radius all have in common? They are all components or measurements of a circle! This clip quickly defines each of these terms using verbal, written, and diagram examples.
Curated OER
STEMbite: Circumference Mystery
Middle school mathematicians might be able to follow as Mr. Vander Heuvel explores the relationship between circumference and diameter. The mystery comes in when he uncovers that for every increased increment of one unit in diameter, the...
Khan Academy
Khan Academy: Algebra: Conic Sections: Three Points Defining a Circle
A video lesson that describes how any three non-collinear points actually define a circle. First it is shown that three points define a triangle. Then it is shown that the circumcenter of that triangle is actually the center of the...
Khan Academy
Khan Academy: Geometry: Ca Geometry: Circle Area Chords Tangent
Demonstrates solutions to problems #71-75 of California Geometry released state test questions. Problems address Pythagorean theorem, 45-45-90 triangles, 30-60-90 triangles, circumscribed polygons, area, chord length, tangents to circles...
Khan Academy
Khan Academy: Geometry: Language and Notation of the Circle
Formally defines a circle and different parts of a circle. Identifies the proper notation for naming different parts of a circle. [11:12]
Khan Academy
Khan Academy: Geometry: Inscribed and Central Angles
Proof that the measure of an inscribed angle is half the measure of a central angle when the angles intercept the same arc. [14:16]
Sophia Learning
Sophia: Converting Between Diameter and Radius: Lesson 3
Given this lesson and either the diameter or radius of a circle, you'll be able to calculate the other measure. It is 3 of 10 in the series titled "Converting Between Diameter and Radius." [2:06]
Khan Academy
Khan Academy: Algebra: Conic Sections: Intro to Circles
The video tutorial discusses conic sections. Students learn about circles. The resource consists of examples with detailed explanations. (9:04).
CK-12 Foundation
Ck 12: Elem Math: Overview of Rectangles Squares Circles and Triangles
[Free Registration/Login may be required to access all resource tools.] Students watch a video overview on various two dimensional shapes including rectangles, squares, circles and triangles.
CK-12 Foundation
Ck 12: Elem Math: Overview of Rectangles Squares Circles and Triangles
[Free Registration/Login may be required to access all resource tools.] Students watch a video overview on the properties of rectangles, squares, circles and triangles.
Khan Academy
Khan Academy: Geometry: Parts of a Circle
Identifies and labels basic parts of a circle: center, diameter, radius, and circumference. This video also appears in the Geometry: Circles strand. [2:01]
Khan Academy
Khan Academy: About Pi and Tau: Rhapsody on the Proof of Pi = 4
This video explores properties of circles and what is wrong with the proof that pi is equal to four.
Khan Academy
Khan Academy: Long Live Tau: Pi Is (Still) Wrong.
Please excuse the simple math and spelling errors. You shouldn't believe anything I say without double-checking even at the best of times. Go here: http://tauday.com/ and here: http://www.math.utah.edu/~palais/pi.html Me: http://vihart.com
Sophia Learning
Sophia: Circle Tutorial
In this video tutorial, a circle is defined further with a mathematical definition and explained using a blue hole in the ocean. A short quiz is available to complete after viewing the video. [2:41]
Sophia Learning
Sophia: Formula for the Area of a Sector
Using prior knowledge of a circle to determine the formula for the area of a sector. Complete assessment to check understanding.
Sophia Learning
Sophia: Parts of a Circle
In this video tutorial, students will review the parts of a circle and what each part represents. Assess learning with a quiz. [2:36]
Sophia Learning
Sophia: Sector Area of a Circle
This video lesson demonstrates how to find the radius and area of a circle using the area of a sector and a central angle measurement. Students can check their understanding with an assessment.
Sophia Learning
Sophia: Circle Vocab 1
Parts of a circle are defined in this lesson. Take a quiz to assess learning.
Virtual Nerd
Virtual Nerd: What Is a Circle?
Take a look at this tutorial to learn about circles and see the different parts of a circle. [3:54]
Math Mammoth
Math Mammoth: Circles: Introduction
This video looks at the properties of circles and students are shown how to draw them using a compass, as well as how to draw one inside a square and how to copy a circle design. [9:23]
Math Planet
Math Planet: Equations of Conic Sections
Video lesson takes a look at three different conic sections and their equations: parabola, circles and ellipses, and hyperbolas. [1:48]
Khan Academy
Khan Academy: Circumference and Area of Circles
Understanding the relationship between the radius, diameter, and circumference of a circle.
Khan Academy
Khan Academy: Triangles: Area of Inscribed Equilateral Triangle
Students explore a problem that requires then to figure out the area of an equilateral triangle inscribed in a circle using a little trigonometry.