Handout
Paul Dawkins

Paul's Online Notes: Algebra: Circles

For Students 9th - 10th
Detailed math tutorial features notes and examples that illustrate graphing circles.
Handout
CK-12 Foundation

Ck 12: Physics: Circular Motion Study Guide

For Students 9th - 10th
This study guide on circular motion covers key terms, centripetal force, linear vs. circular motion, precession, and equations. Includes four example problems with detailed solutions. The guide is available for download with free...
Lesson Plan
OER Commons

Oer Commons: Measuring Circles

For Teachers 7th
Seventh graders will measure the circumference and diameter of round things in the classroom and discover the ratio pi. They will see that the ratio of a circle's circumference to its diameter can be used to solve for the circumference...
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...
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.
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...
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.
Unknown Type
Khan Academy

Khan Academy: Angles in Circles

For Students 4th Standards
Practice measuring angles using a circle protractor, solve problems about angles as part of a circle.
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.
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: G Co Seven Circles Ii

For Teachers 9th - 10th Standards
In this task, seven pennies are placed in a circle so that they are all touching one in the center and their neighbors. Students are asked to find as many rigid motions of the plane as they can which are symmetries of this configuration...
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: F Tf Trig Functions and the Unit Circle

For Teachers 9th - 10th Standards
The purpose of this task is to help students make the connection between the graphs of sin t and cos t and the x and y coordinates of points moving around the unit circle. Students have to match coordinates of points on the graph with...
Unknown Type
Khan Academy

Khan Academy: Points Inside/outside/on a Circle

For Students 9th - 10th
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.
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: 7.g the Circumference of a Circle and the Area

For Teachers 7th Standards
In this lesson plan, 7th graders determine the circumference and area of a circle.
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: 7.g Eight Circles

For Teachers 7th
In this lesson plan, 7th graders use their knowledge of formulas to determine the area and circumference of a circle.
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: 7.g,rp Measuring the Area of a Circle

For Teachers 7th
In this lesson plan, 7th graders answer word problems to determine the area of a circle.
Lesson Plan
CPALMS

Cpalms: Why Are Circles Similar?

For Teachers 9th - 10th Standards
[Free Registration/Login Required] A comprehensive lesson plan for teaching how to prove that all circles are similar by using three types of transformations.
Lesson Plan
Science Buddies

Science Buddies: Circumscribing a Circle About a Triangle

For Teachers 9th - 10th
Here is a project that combines Computer Science and Mathematics. Prove a method for circumscribing a circle about a triangle (as shown). You'll also learn how to create an interactive diagram to illustrate your proof, using an applet...
Lesson Plan
Science Buddies

Science Buddies: Inscribing a Circle in a Triangle Using the Geometry Applet

For Teachers 9th - 10th
Here is a project that combines Computer Science and Mathematics. Prove a method for inscribing a circle within a triangle (as shown). You'll also learn how to create an interactive diagram to illustrate your proof, using an applet that...
Activity
Science Buddies

Science Buddies: Thinking in (Semi )Circles: The Area of the Arbelos

For Students 9th - 10th
The arbelos is the white-shaded region between the three semicircles in the illustration at right. In this project, you'll prove an interesting method for determining the area of the arbelos.
Lesson Plan
ReadWriteThink

Read Write Think: Circular Plot: Prediction Strategies in Reading and Writing

For Teachers 3rd - 5th
Contains plans for two lessons about circular stories like those of Laura Joffe Numeroff, who is known for the book "If You Give a Mouse a Cookie." Students read stories with circular plots as models before composing their own. In...
Graphic
ReadWriteThink

Read Write Think: Venn Diagram, 3 Circles

For Teachers 9th - 10th Standards
A printable Venn Diagram with three circles to use when comparing and contrasting three things or topics. Directions on how to use this graphic organizer as well as lists of teaching ideas and related resources are also provided.
eBook
Mathigon

Mathigon: Geometry: Circle and Pi: Conic Sections

For Students 9th - 10th
The circle is one of four different shapes which can be created using "slices" through a cone, a 3-dimensional solid that has a circular base joined to a single point (called the vertex) by a curved side. If you tilt a cone, you get an...
Graphic
Federal Reserve Bank

Federal Reserve Bank of Atlanta: Circular Flow

For Students 9th - 10th
Explains how resources, goods and services, and payments flow through the economy using the economic model of circular flow.
eBook
CK-12 Foundation

Ck 12: Algebra Ii: 4.2 Right Triangle Trig Extended to Circles With a Model

For Students 9th - 10th Standards
This section explores the relationship between right triangles, circles, and trigonometry. It investigates how a right triangle that is set inside a circle and rotates around the circle is connected to trigonometric functions and their...

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