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Lesson Plan
Curated OER

Deriving the Formula For the Area of a Circle

For Teachers 6th - 12th
Students derive the formula for the area of a circle. They form a rectangle by partitioning a circle using construction paper and scissors.
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Lesson Plan
Curated OER

Exploring Circles

For Teachers 9th - 12th
Students explore circles using a graphing calculator. In this circles lesson, students write the equation of a circle with a given center and radius length. Students find the most appropriate model for each combination of data they...
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Worksheet
Curated OER

Circumference and Area of Circles (A)

For Students 5th - 6th
In this geometry worksheet, students solve 12 problems in which the area and circumference of a circle is calculated to the tenth place. No formulas are given on this page.
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Worksheet
Curated OER

Circumference and Area of Circles (B)

For Students 5th - 6th
In this geometry worksheet, students calculate the area and circumference of 12 circles in which either the diameter or radius is shown. There are no formulas given on this page.
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PPT
Curated OER

Gravity and Circular Motion

For Teachers 9th - 12th
Go around and around in your physics class with this presentation on circular motion. Diagrams bring the definition to life. Formulas for angular acceleration, centripetal force, gravitation, and potential in a radial field are given....
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Lesson Plan
Futures Channel

Folding Circles

For Teachers 7th - 12th Standards
Students investigate properties of circles. In this geometry lesson, students differentiate between similarity and congruence as they observe polygons. They investigate properties of two and three dimensional shape.
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Worksheet
Curated OER

Circle, Count, and Color Shapes

For Students Pre-K - 1st
Get your geometers familiar with shapes as they circle, color, shade, and count sets of rectangles, triangles, circles, squares, and trapezoids. For each of the 10 sets, they examine six figures and follow instructions to mark the...
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Worksheet
Curated OER

Quiz: Area of a Circle

For Students 7th - Higher Ed
Geometers test their mastery at finding the area of a circle with 10 basic problems. Circle diagrams show line segments, points, and diameter. Distance of radii are given. They use pi as 3.14 to calculate the area. No answer key is...
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Lesson Plan
Curated OER

Trace the Circles

For Teachers Pre-K - 1st
For this circles worksheet, students practice tracing 11 dotted and different sized circles on the worksheet. Students practice the skill of tracing dotted lines.
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Worksheet
Curated OER

Circles and Square Based on Position

For Students Pre-K - K
Kindergartners demonstrate their understanding of the position of objects in the environment by drawing a circle around all the pictured objects positioned above the line.  They then draw and X on top of everything below the line and a...
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Lesson Plan
Curated OER

"Circles of Strength: What Do You Stand For?" ~ A Reflection of Us~

For Teachers 6th - 8th
Middle schoolers determine how they are included in "Circles of Strength." In this character activity, students reflect on how they are part of "Circles of Strength" in the "Circle of Life." They make an individual circle that includes...
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Lesson Plan
Curated OER

Inner Circle/Outer Circle Debate Strategy

For Teachers 3rd - Higher Ed
Arranged in facing concentric circles, half the class discusses an issue. The other half of the class takes notes which are then used to fuel a class discussion and to prepare editorial opinions on the topic at hand. So much emphasis is...
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Activity
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Curated OER

Inscribing a Hexagon in a Circle

For Teachers 9th - 11th Standards
This activity is a follow-on activity to inscribing a square in a circle. The overall problem is more complex. It deals with geometric constructions, properties of triangles, and regular hexagons. The final part of the activity finds the...
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Lesson Plan
Curated OER

Tangent Lines and the Radius of a Circle

For Teachers 9th - 12th Standards
Your Geometry learners will collaboratively prove that the tangent line of a circle is perpendicular to the radius of the circle. A deliberately sparse introduction allows for a variety of approaches to find a solution. 
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Activity
Curated OER

Inscribing a Square in a Circle

For Teachers 9th - 11th Standards
Inscribing a square in a circle brings up a number of interesting geometry topics including triangle congruence and how to prove a quadrilateral is a square. This activity is followed up by finding the area of the square and determining...
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Lesson Plan
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Illustrative Mathematics

Representing Half of a Circle

For Teachers 2nd - 4th Standards
Geometric shapes make great visual models for introducing young mathematicians to the concept of fractions. Looking at a series of four circles, students are asked to determine whether or not one half of each circle is shaded. To support...
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Lesson Plan
Curated OER

Circular Flows

For Teachers 9th - 12th
To study circular flow, learners use the plans to trace through a series of interconnected economic and financial flows to explain the workings of the American economy. They use the model developed to comprehend the effects of Federal...
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Lesson Plan
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Curated OER

Talking Sticks Literature Circle

For Teachers 6th - 7th
Following the six-step process for a talking sticks literature circle, group members choose a leader for the discussion, summarize the reading, discuss journal entries and questions, set reading goals, and write reflections. I think this...
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Interactive
CK-12 Foundation

Interpretation of Circle Graphs: Northwest Region Population Pie

For Students 8th - 11th
Given populations of the five Northwestern states, learners create a circle graph. Using the data and the pie chart, they make comparisons between the populations of the states. Finally, the pupils determine how the chart will change...
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Activity
Illustrative Mathematics

Tangent to a Circle From a Point

For Teachers 9th - 10th Standards
Learners see application of construction techniques in a short but sophisticated problem. Combining the properties of inscribed triangles with tangent lines and radii makes a nice bridge between units, a way of using information about...
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Worksheet
Curated OER

Circles

For Students 7th
For this circles worksheet, 7th graders identify and complete 6 different problems that include determining various parts of a circle. First, they identify and define each circle term listed on the left. Then, students color each term...
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Printables
Curated OER

Drawing Circles

For Teachers Pre-K - K
In this circles worksheet, students look at 6 rows of circles, count the circles already drawn on each line and then draw additional circles in each row to equal 5.
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Organizer
Curated OER

Fraction Circles

For Students 1st - 2nd
A worksheet with four fraction circles which could be used for a plethora of activities. One circle represents a whole, the others are halves, thirds, and fourths. The possibilities are as many as you can think of.
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Activity
Illustrative Mathematics

Slopes and Circles

For Teachers 9th - 12th Standards
An upper-level treatment of what is often presented as a basic concept (the right angle of an inscribed circle on the diameter), this activity really elevates the mathematical thought of the learner! Expected to develop formulas from...

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