Curated OER
Deriving the Formula For the Area of a Circle
Students derive the formula for the area of a circle. They form a rectangle by partitioning a circle using construction paper and scissors.
Curated OER
Exploring Circles
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...
Curated OER
Circumference and Area of Circles (A)
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.
Curated OER
Circumference and Area of Circles (B)
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.
Curated OER
Gravity and Circular Motion
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....
Futures Channel
Folding Circles
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.
Curated OER
Circle, Count, and Color Shapes
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...
Curated OER
Quiz: Area of a Circle
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...
Curated OER
Trace the Circles
In 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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Circles and Square Based on Position
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...
Curated OER
"Circles of Strength: What Do You Stand For?" ~ A Reflection of Us~
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...
Curated OER
Inner Circle/Outer Circle Debate Strategy
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...
Curated OER
Inscribing a Hexagon in a Circle
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...
Curated OER
Tangent Lines and the Radius of a Circle
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.
Curated OER
Inscribing a Square in a Circle
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...
NASA
It All Comes Full Circle
How long does it take spacecraft go around the earth? Using the circular orbits of the space shuttle and the International Space Station, groups determine the distance traveled in one revolution, then calculate the distance traveled...
Illustrative Mathematics
Representing Half of a Circle
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...
Curated OER
Circular Flows
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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Talking Sticks Literature Circle
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...
CK-12 Foundation
Interpretation of Circle Graphs: Northwest Region Population Pie
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...
Illustrative Mathematics
Tangent to a Circle From a Point
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...
Curated OER
Circles
In 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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Drawing Circles
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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Fraction Circles
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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