Unit Plan
CK-12 Foundation

Ck 12: Geometry: Radius or Diameter of a Circle Given Area

For Students 6th - 7th
[Free Registration/Login may be required to access all resource tools.] Find the radius or diameter of a circle given its area.
Handout
Math Open Reference

Math Open Reference: Radius of a Circle

For Students 9th - 10th Standards
Learn about the radius of a circle with this useful reference guide. Provides a detailed definition, examples, and an interactive activity that enhances further explanation. Includes links to related topics.
Handout
Cuemath

Cuemath: Radius

For Students 9th - 10th Standards
This reference tool explores the radius of a circle. Provides definitions, solved examples, and practice questions with answers.
Handout
Math Open Reference

Math Open Reference: Diameter

For Students 9th - 10th Standards
A complete reference guide to diameters. It provides definitions, examples, and interactive activities that enhance further explanation. Includes links to related topics.
Unknown Type
Khan Academy

Khan Academy: Radius and Diameter

For Students 7th Standards
Practice problems finding radius and diameter of a circle.
Unit Plan
Khan Academy

Khan Academy: Radius and Diameter

For Students 6th - 8th
Practice finding the radius and diameter of a circle using both vocabulary and visuals. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Radius or Diameter of a Circle Given Area

For Students 7th
[Free Registration/Login may be required to access all resource tools.] Find the radius or diameter of a circle given the area of the circle
Activity
Discovery Education

Discovery Education: Web Math: Find Out Things About Circles

For Students 9th - 10th Standards
This WebMath site will assist with finding the radius, diameter, circumference, and area of a circle.
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Diameter or Radius of a Circle Given Circumference

For Students 6th - 8th
[Free Registration/Login may be required to access all resource tools.] In this lesson students find the diameter or radius of a circle given the circumference. Students examine guided notes, review guided practice, watch instructional...
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Diameter or Radius of a Circle Given Circumference

For Students 6th - 8th
[Free Registration/Login may be required to access all resource tools.] In this lesson students find the diameter or radius of a circle given its circumference. Students examine guided notes, review guided practice, watch instructional...
Activity
CK-12 Foundation

Ck 12: Area of a Circle: Hula Hoop Radius

For Students 7th - 9th
[Free Registration/Login Required] Students use the radius and diameter to determine the area of a circle. Click challenge me to answer practice questions and click learn more to watch a video.
Lesson Plan
Alabama Learning Exchange

Alex: Talking in Circles

For Teachers 3rd - 5th
The learners will identify parts of the circle including center, radius, diameter, chord, and arc. This lesson plan was created by exemplary Alabama Math Teachers through the AMSTI project.
Unit Plan
Khan Academy

Khan Academy: Praxis Core Math: Circles Lesson

For Students 9th - 10th
A basic review of circles and how to calculate the circumference, radius, diameter, and area. Includes practice questions.
Unknown Type
Houghton Mifflin Harcourt

Holt, Rinehart and Winston: Homework Help Independent Practice: Circles

For Students 6th - 8th Standards
Get independent practice working with finding the circumference, area and radius of circles. Each incorrect response gets a text box explanation and another try. Correct responses are confirmed.
Website
PBS

Pbs Learning Media: Tricking Hacker

For Students 3rd - 8th
In this video segment from Cyberchase, the CyberSquad must reclaim the Totally Rad Ring by measuring its radius to create a perfect duplicate.
Article
Mocomi & Anibrain Digital Technologies

Mocomi: What Is Circle?

For Students 2nd - 8th
Discusses the radius, diameter, circumference, and area of a circle.
Unit Plan
Cuemath

Cuemath: Circles

For Students 3rd - 8th Standards
Explore everything about circles. Learn various parts of a circle like a diameter, radius, circumference, circles chord, tangent circles, major arc, segment, sector, and discover other interesting aspects of it. Try your hand at solving...
Handout
Math Is Fun

Math Is Fun: Definition of Circumference

For Students 3rd - 8th Standards
Definition of circumference. Click the "here's more" link to learn more about a circle; its radius and diameter, area, lines, slices and common sectors.
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Pi

For Students 6th
[Free Registration/Login may be required to access all resource tools.] Identify pi as the ratio of a circle's diameter to a circle's circumference.
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.
Website
PBS

Pbs Learning Media: Finding the Circle's Center

For Students 3rd - 5th
In this video segment [3:10] from Cyberchase, the CyberSquad must find the exact center of a circle in order to save Motherboard.
Activity
Varsity Tutors

Varsity Tutors: Hotmath: Practice Problems: Circle Exercises

For Students 9th - 10th
Twenty-five problems cover various circle activities. 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 each step of your...
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: G C Right Triangles Inscribed in Circles I

For Teachers 9th - 10th Standards
This task provides a good opportunity to use isosceles triangles and their properties to show an interesting and important result about triangles inscribed in a circle with one side of the triangle a diameter. The fact that these...
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: G C Right Triangles Inscribed in Circles Ii

For Teachers 9th - 10th Standards
In this task, students analyze the characteristics of a right triangle that has two sides labeled with midpoints and show that the triangle is inscribed in a circle with a diameter the length of its hypotenuse. Aligns with G-C.A.2.

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