Unite for Literacy
Unite for Literacy: Know and Learn: Spot the Shapes
A book about the shapes around us. Includes audio narration in 17 additional languages with text in English.
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.
Texas Education Agency
Texas Gateway: Applying Geometric Probability
The student will find the area of polygons and circles. Then, the student will use probablity to solve real-world problems.
Other
Visnos: Explore Pi
This interactive demonstration shows firstly how pi relates to the circumference of a circle. This is achieved using a regular polygon approximation, the closed polygon is opened to reveal this magical number. The area of a circle is...
PBS
Pbs Learning Media: Directions to Hen Rock
The CyberSquad has to deal with angles and distances to locate a treasure chest in this video segment from Cyberchase.
PBS
Pbs Learning Media: Tricking Hacker
In this video segment from Cyberchase, the CyberSquad must reclaim the Totally Rad Ring by measuring its radius to create a perfect duplicate.
National Council of Teachers of Mathematics
The Math Forum: Elementary Geometry Circles
The Math Forum offers an archive of question and answer sessions on circles and how they relate to geometry.
Texas A&M University
Texas A&m University: Archimedes of Syracuse
This site is provided for by the Texas A&M University. Archimedes contribution to finding the exact value of pi is discussed in this biography of Archimedes.
Texas Instruments
Texas Instruments: Cabri Jr. Perpendicular Bisector of a Circle
This activity uses Cabri Jr. to discover that the perpendicular of a chord passes through the centre of a circle. Microsoft Word documents are attached to support the lesson.
Texas Instruments
Texas Instruments: Circle Equations
Students will practice their knowledge of circle equations in the y= form by matching equations with pictures of various circles.
Texas Instruments
Texas Instruments: Angles in Circles
The student will use the Cabri Jr. APP to discover the relationship between inscribed and central angles in a circle.
Texas Instruments
Texas Instruments: Mc Dougal Littell Algebra 2: Graph Equations of Circles
Students can use the TI-84 Plus family to graph equations of circles.
Texas Instruments
Texas Instruments: Radius, Diameter, and Circumference of a Circle
In this activity, students will learn the basic concepts of the circle. They explore the relationship between the diameter and the radius, and between the diameter and circumference of a circle. They also get familiar with the Greek...
Texas Instruments
Texas Instruments: Match the Graph (Circles)
Students will learn about the equation for a circle by using a Study Cards stack. Later, students will attempt to match the graph of a circle from a digital picture, using the form learned previously, and approximating the center and...
Texas Instruments
Texas Instruments: Conic Equations
This Learn Check file is a review of writing conic sections given the graph of a conic section. Students are asked to use the graphs to write the equations for a ellipse, circle, parabola, and hyperbola.
University of Michigan
Virtual Conics
You may have to download first, but the two VRML icons near the bottom of the page allow you to observe the plane intersecting the cone to form the conic. Controls are present to change the angle of the plane and your view of the...
Science Education Resource Center at Carleton College
Serc: Investigating Motion: Paths of a Marble
In this activity, children will investigate the paths that marbles take once set into motion and then how to change those paths, noting if and how they change.
Texas A&M University
Wtamu Virtual Math Lab: College Algebra: Circles
Use this tutorial to learn about the standard-form equation for a circle. Several step-by-step solutions and examples help you understand the part of the circle and how they relate to the equation.
The Math League
The Math League: Area and Perimeter
This tutorial provides a brief introduction about what area is, then gives the formulas for area of a square, rectangle, parallelogram, trapezoid, triangle, and circle. Examples of each formula are provided.
The Math League
The Math League: Figures and Polygons
This site provides definitions of different types of polygons and figures.
TED Talks
Ted: Ted Ed: Pi With Pies
Numberphile did something crazy - attempted to calculate Pi using real Pies. Watch and see how close they got to the real figure of 3.14159265359. [3:13]
University of Saskatchewan (Canada)
University of Saskatchewan: Equation of a Circle
Two problems that help with the understanding of how to find the general equation of a circle. Includes a graph.
Other
Ic Teachers: Shapes, Circles (Basic)
This basic website will give you lots of information about circles. There are also some questions to test your circle knowledge.
Other
Sprk: Orb Basic Lesson 2 [Pdf]
Learners will use Sphero to explore the computer science concepts of variables and conditionals (ifstatements). They will use OrbBasic, which is a text-based programming language for the Sphero. They will write a simple program that...