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- Abstract:
An interactive applet and associated web page that demonstrate the circumference of a circle. The applet shows a circle with a radius line. The radius endpoints are draggable and the circle is resized accordingly. The formula relating radius to circumference is updated continually as you drag. Introduces the idea of Pi. The formula can be hidden for class discussion and estimation. See also the entries for circumference and diameter. See also entries for radius and diameter. Applet can be enlarged to full screen size for use with a classroom projector. This resource is a component of the Math Open Reference Interactive Geometry textbook project at http://www.mathopenref.com.
- Subject:
- Mathematics and Statistics
- Grade Level:
- Secondary
- Collection:
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Math Open Reference
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This lesson will offer a hands-on opportunity to explore and construct circles. Students will develop a definition for identifying the parts of a circle such as the center, radius, diameter, chord, and circumference. Students will use compasses and rulers in constructing these parts of a circle.
- Subject:
- Mathematics and Statistics
- Grade Level:
- Primary, Secondary
- Collection:
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LEARN NC Lesson Plans
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This lesson introduces students to Pi through the discovery method of instruction. Students practice simple measuring skills to discover the relationship between the circumference and diameter of circular objects (Pi). They will be able to use this concept to find the circumference of any circle when the diameter is given.
- Subject:
- Mathematics and Statistics
- Grade Level:
- Primary, Secondary
- Collection:
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LEARN NC Lesson Plans
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(Complete Item Description)
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This geometry lesson discusses the properties of a circle and defines the ideas of radius, diameter and circumference. [Geometry playlist: Lesson 12 of 31]
- Subject:
- Mathematics and Statistics
- Grade Level:
- Secondary
- Collection:
-
Khan Academy
Evaluated
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(Complete Item Description)
- Abstract:
Geometry can be an exercise arena for strengthening those logic muscles that middle school students need to flex. When we work with a geometric figure—a circle, for instance—and apply the ancient tools of compass and straightedge, geometry can become a rich ground for developing design. And a circle has size, so a unit on this topic necessarily brings in the mathematics of its measurement. Circles, then, is a geometric topic that can provide mental challenge, opportunity for artistic development, and connections to both the history of measurement and its everyday applications.
For this unit we have selected online activities that will enable your students to look at circles from these various viewpoints. The activities range from measurement to theorems about the circle to art and symmetry. Many will engage students in solving problems or in creating designs. Others will allow them to investigate the thinking behind the area and circumference formulas, either through virtual simulations or hands-on projects. We hope these activities will add to your repertoire of ways to present the "many-sided" topic of circles.
- Subject:
- Mathematics and Statistics
- Grade Level:
- Primary, Secondary
- Collection:
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Middle School Portal
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(Complete Item Description)
- Abstract:
Students learn how to use customary measurement using inches or centimeters and data collection and graphing simultaneously. Students will measure the length of their foot, arm span, hand span, or head circumference to the nearest centimeter or inch. Next they will collect and represent their data by constructing a graph.
- Subject:
- Mathematics and Statistics
- Grade Level:
- Primary
- Collection:
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LEARN NC Lesson Plans
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(Complete Item Description)
- Abstract:
Adam Savage walks through two spectacular examples of profound scientific discoveries that came from simple, creative methods anyone could have followed -- Eratosthenes' calculation of the Earth's circumference around 200 BC and Hippolyte Fizeau's measurement of the speed of light in 1849. A quiz, thought provoking question, and links for further study are provided to create a lesson around the 7-minute video. Educators may use the platform to easily "Flip" or create their own lesson for use with their students of any age or level.
- Subject:
- Science and Technology
- Grade Level:
- Secondary, Post-secondary
- Collection:
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TED-Ed
Evaluated
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- Abstract:
In this activity, students will learn that math is important in navigation and engineering. Ancient land and sea navigators started with the most basic of navigation equations (Speed x Time = Distance). Today, navigational satellites use equations that take into account the relative effects of space and time. However, even these high-tech wonders cannot be built without pure and simple math concepts basic geometry and trigonometry that have been used for thousands of years. In this activity, students will use learn about triangles and how they can help determine distances.
- Subject:
- Mathematics and Statistics, Science and Technology
- Grade Level:
- Primary, Secondary
- Collection:
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TeachEngineering
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