Unit Plan
Cuemath

Cuemath: Segment of a Circle

For Students 9th - 10th
This lesson expands your knowledge about circles by learning about the segment of a circle, which will include its mathematical definition, area of the segment, types of segments in a circle, theorems based on a segment of a circle, and...
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.
Unit Plan
Cuemath

Cuemath: Chords of a Circle

For Students 9th - 10th Standards
A comprehensive guide for learning all about chords of a circle with definitions, chords of a circle theorems, intersecting chords theorem, congruent circles, diameter, solved examples, and practice questions.
Handout
Cuemath

Cuemath: Area of a Circle

For Students 9th - 10th Standards
This mini-lesson explores the area of a circle. Provides a definition, examples, and practice questions with answers.
Unknown Type
Khan Academy

Khan Academy: Points Inside/outside/on a Circle

For Students 9th - 10th Standards
Given the center and radius of a circle, determine if a point is inside of the circle, on the circle, or outside of the circle. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or...
Handout
CK-12 Foundation

Ck 12: Geometry: Properties of a Circle Study Guide

For Students 9th - 10th Standards
[Free Registration/Login may be required to access all resource tools.] This study guide reviews the terminology for circles (tangent, arcs, central angles) and the equation for a circle.
eBook
Mathigon

Mathigon: Geometry: Circle and Pi: Introduction

For Students 9th - 10th Standards
This lesson focuses on the characteristics of a circle including similarity, radius, circumference, and Pi. It provides formulas to determine the area of a circle, calculating Pi, and learning exercises throughout.
Activity
Annenberg Foundation

Annenberg Learner: Geometry: Circles: Inscribed Angles

For Students 4th - 8th Standards
Study inscribed angles in semicircles and quarter-circles. What conjectures can you make about the measure of an inscribed angle in semi- or quarter-circles?
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Circles in the Coordinate Plane

For Students 9th - 10th Standards
[Free Registration/Login may be required to access all resource tools.] This concept teaches students how to graph circles and find the standard equations of circles. Students examine guided notes, review guided practice, watch...
eBook
Math Planet

Math Planet: Geometry: Basic Information About Circles

For Students 9th - 10th Standards
A definition, examples, and a video lesson all help to explain basic information about circles. [0:36]
eBook
Math Planet

Math Planet: Geometry: Advanced Information About Circles

For Students 9th - 10th Standards
Provides advanced information about circles through the use of examples and a brief video lesson. [1:00]
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Arcs in Circles

For Students 9th - 10th
[Free Registration/Login may be required to access all resource tools.] This concept teaches students properties of arcs and central angles in circles. Students examine guided notes, review guided practice, watch instructional videos and...
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
Oswego City School District

Regents Exam Prep Center: Arcs in Circles

For Students 9th - 10th
Provided are definitions of arcs in circles, an example and theorems to assist with test preparation.
eBook
CK-12 Foundation

Ck 12: Interactive Geometry: 10.2 Equations of Circles

For Students 9th - 10th Standards
Derive the equation of a circle with the help of the Pythagorean Theorem.
eBook
CK-12 Foundation

Ck 12: Interactive Geometry: 1.8 Circles

For Students 9th - 10th
Understand circles and their measurement applications.
eBook
Mathigon

Mathigon: Geometry: Circle and Pi: Degrees and Radians

For Students 9th - 10th Standards
Rather than dividing a circle into some number of segments (like 360 degrees), mathematicians often prefer to measure angles using the circumference of a unit circle - a circle with radius 1. This way of measuring angles is called...
Handout
CK-12 Foundation

Ck 12: Geometry: Circumference and Arc Length Study Guide

For Students 9th - 10th Standards
This study guide on circumference and arc length covers key vocabulary, the parts of a circle, and formulas for circumference, area, and arc length. It is available for download with free registration.
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Angles Outside a Circle Intermediate

For Students 9th - 10th Standards
[Free Registration/Login may be required to access all resource tools.] This concept teaches students how to calculate angles formed outside a circle by tangent and secant lines.
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Parts of Circles

For Students 9th - 10th
[Free Registration/Login may be required to access all resource tools.] This concept teaches students the vocabulary for the parts of circles, including lines passing through circles.
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
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Angles Outside a Circle

For Students 9th - 10th Standards
[Free Registration/Login may be required to access all resource tools.] Solve problems containing angles outside a circle.
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Circles in the Coordinate Plane

For Students 9th - 10th Standards
[Free Registration/Login may be required to access all resource tools.] In this lesson students find the standard equation of a circle. Students examine guided notes, review guided practice, watch instructional videos and attempt...

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