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Activity
Other

Ic Teachers: Shapes, Circles (Basic)

For Students 5th - 9th Standards
This basic website will give you lots of information about circles. There are also some questions to test your circle knowledge.
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Unit Plan
CK-12 Foundation

Ck 12: Geometry: Area of a Circle

For Students 9th - 10th
[Free Registration/Login may be required to access all resource tools.] In this lesson students calculate the area of circles and the area of sectors of circles by using given information and formulas. Students examine guided notes,...
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Activity
Math Open Reference

Math Open Reference: Circles

For Students 9th - 10th Standards
A complete reference guide to circles including parts, angles, and arcs. It provides definitions and interactive activities that enhance further explanation.
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Unit Plan
BBC

Bbc: Bitesize: Maths: 2 D Shapes

For Students 2nd - 8th Standards
Learn about the properties of 2-D shapes: circles, triangles, polygons, and quadrilaterals. Includes information, video, and examples about each, with games and quizzes for reinforcement.
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Unit Plan
CK-12 Foundation

Ck 12: Geometry: Area of a Circle

For Students 9th - 10th
[Free Registration/Login may be required to access all resource tools.] This concept teaches students how to calculate the area of a circle. Students examine guided notes, review guided practice, watch instructional videos and attempt...
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Handout
Quia

Ixl Learning: Area of Circles

For Students 7th - 9th Standards
Brush up on your math skills relating to the area of circles then try some practice problems to test your understanding.
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Interactive
Calculator Soup

Calculator Soup: Circle Calculator

For Students 9th - 10th Standards
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.
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Article
Mocomi & Anibrain Digital Technologies

Mocomi: What Is Circle?

For Students 2nd - 8th
Discusses the radius, diameter, circumference, and area of a circle.
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Handout
Wolfram Research

Wolfram Math World: Circle

For Students 9th - 10th Standards
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.
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Whiteboard
ClassFlow

Class Flow: Area of a Circle

For Teachers 6th - 8th Standards
[Free Registration/Login Required] This flipchart reviews basic geometric forms in nature and real objects. Students are then given opportunities to find the area of circle and parts of a circle, given the radius and/or diameter of the...
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Unit Plan
Khan Academy

Khan Academy: Circumference of a Circle

For Students 6th - 8th
Find the circumference of a circle when given either the radius or diameter.Find the radius or diameter of a circle when given the circumference.Students receive immediate feedback and have the opportunity to try questions repeatedly,...
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Lesson Plan
National Council of Teachers of Mathematics

The Math Forum: Multicultural Math Fair: Srinivasa's Spheres

For Teachers 3rd - 8th
Straightforward lesson that introduces students to pi by letting them measure real objects and solve a challenge problem. Includes instructions and a "Data Sheet" for keeping track of measurements. Available in English and Spanish.
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Whiteboard
ClassFlow

Class Flow: Circles Geometry

For Teachers 6th - 8th Standards
[Free Registration/Login Required] Students identify segments and lines related to circles and the properties of a tangent to a circle.
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Whiteboard
ClassFlow

Class Flow: Dimensions

For Teachers 9th - 10th Standards
[Free Registration/Login Required] Students learn what surface area is on geometric figures, and find volume, lengths, and areas of figures.
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Unit Plan
Wolfram Research

Wolfram Math World: Sphere

For Students 9th - 10th
This webpage thoroughly discusses the math of spheres. Includes the equation for a sphere in Cartesian and spherical coordinates as well as parametrically. Surface Area, volume, and curvature are addressed at this extensive site.
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Lesson Plan
NASA

Nasa: Imagine the Universe: How Big Is That Star

For Teachers 9th - 10th
This 2-5 day lesson plan investigates the diameter, radius and mass among several stars in order to understand stellar behavior, particularly in a binary system.
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Interactive
Physics Aviary

Physics Aviary: Resistance of a Wire

For Students 9th - 10th
This lab is designed to have students investigate the factors that affect the resistance of a wire. Students will be able to adjust the length of the wire, the diameter of the wire and the material from which the wire is constructed....
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Unit Plan
Khan Academy

Khan Academy: Area of a Circle

For Students 6th - 8th Standards
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.
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eBook
AAA Math

Aaa Math: Circumference of a Circle

For Students 9th - 10th Standards
Calculating the circumference or perimeter of a circle has gotten easier with this formula and practice for finding the circumference.
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Unit Plan
Cuemath

Cuemath: Circumference of a Circle

For Students 6th - 8th Standards
Understand the concept of circumference by learning the definition, circumference geometry definition, circumference equation, and circumference of a circle formula. Check-out the interactive simulation for better understanding and try...
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Activity
National Council of Teachers of Mathematics

The Math Forum: Pi Day

For Teachers 9th - 10th
Need some ideas for Pi Day on March 14th? You can get some great resources at this location. There are all kinds of links available.
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Website
Ducksters

Ducksters: Kids Math: Circle Geometry

For Students 4th - 8th
Circle Geometry math for kids contains information for students to learn about terms radius, diameter, circumference, chord, and pi.
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Graphic
Math2

Math2: Circles

For Students 9th - 10th Standards
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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Handout
University of North Carolina

A Dictionary of Units of Measurement

For Students 9th - 10th
This site contains an extensive list of various units of measurement known internationally and across several disciplines. Unit symbols are also included.

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