Khan Academy
Khan Academy: Praxis Core Math: Circles Lesson
A basic review of circles and how to calculate the circumference, radius, diameter, and area. Includes practice questions.
Other
Nearpod: Circles & Pi
In this lesson plan, 7th graders will learn vocabulary associated with circles and use formulas to find the area and circumference of circles.
E-learning for Kids
E Learning for Kids: Math: World of Fish: Geometry
Students will play an interactive game to identify the circumference, radius, center, and diameter of circles.
Calculator Soup
Calculator Soup: Sphere Calculator
This online calculator will calculate the 3 unknown values of a sphere given any 1 known variable including radius r, surface area A, volume V and circumference C. It will also give the answers for volume, surface area, and circumference...
Cornell University
Cornell University: Astronomy: Eratosthenes
Learn how Greek mathematician Eratosthenes used geometry to estimate the circumference of the Earth.
Science Struck
Science Struck: A Scientific Explanation to What Causes Day and Night
Explains how the rotation and the axial tilt of the Earth are responsible for the phenomenon of day and night. Provides information about the Sun, the solar system, and the Earth, and how the circumference of the Earth was first measured...
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.
Science and Mathematics Initiative for Learning Enhancement (SMILE)
Smile: Diameter,circumference,radius & the Discovery of Pi
This site provides a good project for young scholars to use to explore the circumference of a circle.
Ministry of Education and Universities of the Region of Murcia (Spain)
Ministerio De Educacion Y Ciencia: Circunferencia Y Circulo: Longitudes Y Areas
Reinforce your knowledge of the circumference and the area of a circle with these activities. [Requires Java.]
ClassFlow
Class Flow: Circles
[Free Registration/Login Required] This flipchart has information and practice regarding finding area and circumference of circles.
ClassFlow
Class Flow: Circles and Angles
[Free Registration/Login Required] In this flipchart students practice identifying parts of a circle, measure angles, and practice solving area and circumference problems.
ClassFlow
Class Flow: Cylinder Volume
[Free Registration/Login Required] This flipchart contains activities and instructions for students on how to solve for the volume of a cylinder and finding the circumference of a circle.
University of Cambridge
University of Cambridge: Nrich: Watching the Wheels Go `Round and `Round
Use the formula for the circumference of a circle to solve the challenge of this problem. The solution is available at this one page website.
Calculator Soup
Calculator Soup: Circle Calculator
Use this circle calculator to find the area, circumference, radius, or diameter of a circle. Given any one variable A, C, r or d of a circle you can calculate the other three unknowns.
Mocomi & Anibrain Digital Technologies
Mocomi: What Is Circle?
Discusses the radius, diameter, circumference, and area of a circle.
Khan Academy
Khan Academy: Area of a Circle
Find the area of a circle given its radius, diameter, or circumference. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
TeachEngineering
Teach Engineering: Let's Take a Slice of Pi
Working as a team, students discover that the value of pi (3.1415926) is a constant and applies to all different sized circles. The team builds a basic robot and programs it to travel in a circular motion. A marker attached to the robot...
Utah Education Network
Uen: Why Do Soccer Balls Get Flat Science Fair Project
Discover what happens to the circumference of a balloon when it is placed in dry ice, kept at room temperature, and when it is warmed by a hairdryer.
Center for Innovation in Engineering and Science Education, Stevens Institute of Technology
Ciese: Collaborative Projects
Using a variety of science topics, these projects link your class with classes around the world in data collection and analysis. There are projects recommended for all grade levels. Begin dates and end dates are listed to help in...
Varsity Tutors
Varsity Tutors: Hotmath: Practice Problems: Geometry in the Plane
Twenty-four problems presented on a variety of Plane Geometry topics. 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...
Center for Innovation in Engineering and Science Education, Stevens Institute of Technology
Ciese: K 12 Education Curriculum: Online Classroom Projects
This site presents projects for individual classrooms and collaborative projects that can be done with other classes or schools. Most of these are science projects.
National Council of Teachers of Mathematics
Nctm: Figure This: Math Challenges for Families
Students, teachers, and parents alike will enjoy this challenging math site. It contains a clever brain teaser section plus creative problems related to algebra, geometry, measurement, numbers, statistics, and probability. A Spanish...
Science Education Resource Center at Carleton College
Serc: Changes in Gas Volume/gas Laws
In this activity young scholars will observe how temperature affects different types of gases. First students will blow up a round balloon. They will need to measure the circumference in centimeters of the fattest part of the balloon....
Mr. Martini's Classroom
Mr. Martini's Classroom: Circles Geometry Review
This resource provides two levels of multiple choice questions to review the parts of a circle as well as area and perimeter.
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