Circles Teacher Resources

How can you make a circle with x's and y's? A video tutorial explains how to write the equation of a circle with a center at the origin. The tutorial also demonstrates how to analyze the equation. Following the lesson, pupils use the...

Come full circle with a lesson on angles. A noteworthy video describes how to calculate the measures of missing angles in a diagram. It goes through several examples in which the sum of the angles is always a full circle, or 360 degrees.

What a great big skillet you have. The resource introduces the class to the world's largest stainless steel skillet. The class creates a model of the skillet and a typical 12-inch skillet and compares the relative sizes of their areas....

Don't go off on a tangent—let the video do the talking! A video lesson demonstrates how to write the equation of a line tangent to a circle given the point of tangency and the equation of the circle. The instructor explains both a...

Mark off the length of the radius around the circle. Using a compass, the presenter shows how to construct a regular hexagon in a circle. Pupils see how triangles formed in the hexagon are equilateral, allowing for the construction to...

Short, but to the point, an informative resource does the job! A quick video lesson describes how to calculate the area of a semi-circle. Learners watch the video tutorial and then practice with the included practice problems.

No math lesson would be complete without examples. A short video works through examples highlighting circle theorems. This includes problems where individuals must take multiple theorems into account to determine the solution.

Here is a way to help your charges identify circles and spheres. For this shapes geometry and technology lesson, students identify and draw circles and explain the related attributes. They recognize circles and spheres while exploring...

In this circle graphs learning exercise, students solve and complete 8 different problems that include word problems referring to two different circle graphs shown. First, they follow the directions for each problem and complete the...

Tenth graders apply various circle formulas to determine radii, diameter, circumference, area, arc length, and sector area. The two page worksheet contains twenty-five problems. Answers are not provided. 

Young geometers explore the concept of circumference and area of circles. They discuss what information is needed to find circumference and area. The resource employs several instructional methods: Frayer Model for Vocabulary, literature...

Students calculate the area and circumference of a circle as the instructional activity is presented through an animated Microsoft PowerPoint presentation. They then complete a project to review the previous day's material.

Students investigate the concept of area and how it can be applied to a circle. They use the right formula in order to solve different problems. The teacher leads the class through different examples and serves as a resource during...

Learners view two PowerPoints and practice computing the area and circumference of circles. They must use given formulas to make their computations. The lesson includes links to both PowerPoints as well as a worksheet (with answer key).

Students derive the formula for the area of a circle. They form a rectangle by partitioning a circle using construction paper and scissors.

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...

In this geometry activity, 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.

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.

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....

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.

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...

Before you can do anything with circles, you need to know the parts of the circle. Viewers of a short video see how to label relevant information about a circle. The resource covers radius, diameter, circumference, chord, tangent, arc,...

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...

In this circles worksheet, students practice tracing 11 dotted and different sized circles on the worksheet. Students practice the skill of tracing dotted lines.