Worksheet
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Making Two-Dimensional Shapes

For Students Pre-K - 1st
Use this introductory geometry worksheet as a projected warm-up for your class, doing it together and then revealing the explanation on the bottom half. Learners examine a square and a circle, each bisected by a dotted line. They must...
Worksheet
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Skills Practice: Area of Circles

For Students 7th - 8th
Two practice pages with 10 problems each show circles and give their radii. Learners calculate the area. Answers are provided. 
Lesson Plan
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Circles to Spheres

For Teachers K - 3rd
Students investigate circles and spheres. In this space shapes lesson plan, students compare and contrast two-dimensional and three-dimensional shapes. Students investigate the relationship between plane and space shapes.
Lesson Plan
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As The World Curves

For Teachers 10th - 12th
Students partisipate in a web scavenger hunt on an introductory lesson for conic sections. They become familiar with general forms of the equations, what they look like, and how they are used in the real-world.
Lesson Plan
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Measuring the Diameter of the Sun

For Teachers 9th
Ninth graders study the sun and its distance from Earth.  In this Sun's diameter lesson plan students examine how measurement data permits accurate measurement of the sun's diameter. 
PPT
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Geometry

For Teachers 1st - 2nd
Use this resource as an anticipatory set before a lesson on geometric shapes. A hidden picture slowly appears to reveal a circle, cube, and cylinder. It is a colorful presentation.
Interactive
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Circumference of Circle Worksheets

For Students 6th - 12th
In this online math worksheet, students determine the circumference of a variety of circles given their diameter. This excellent resource allows the students to check their answers, and to get "hints" should they run into difficulties. A...
Interactive
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Word Problems that involve Circles

For Students 9th - 12th
In this online math worksheet, students solve word problems the involve circles. This excellent resource allows the students to check their answers, and to get "hints" should they run into difficulties. A terrific teaching tool!
Interactive
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Geometry Worksheets - Volume of Cylinders

For Students 9th - 12th
In this online math worksheet, students determine the volume of cylinders given their dimensions. This excellent resource allows the students to check their answers, and to get "hints" should they run into difficulties. A terrific...
Interactive
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Word Problems that involve Circles

For Students 10th
In this geometry worksheet, 10th graders solve application word problems based on knowledge of a circle. The one page interactive worksheet contains four questions. Answers and hints are included. 
Interactive
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Area of Shaded Regions that involve Circles

For Students 9th - 12th
In this online math worksheet, students determine the area of shaded regions within a circle. This excellent resource allows the students to check their answers, and to get "hints" should they run into difficulties. A terrific teaching...
Interactive
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Circle Problems - Radius, Diameter, Circumference and Area

For Students 9th - 12th
In this online math instructional activity, students determine the radius, circumference, diameter and area of circles. This excellent resource allows the students to check their answers, and to get "hints" should they run into...
Lesson Plan
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Radius, Diameter and Area

For Teachers 8th - 9th
Young scholars identify the radius and diameter of a circle. In this geometry lesson, students calculate the volume and area of a cylinder and circle. They relate the circumference of a circle to Pi.
Worksheet
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Discovering Pi

For Students 5th - 10th
In this math worksheet, students find the radius, diameter, and circumference of circles when pi is given. Examples are given in this well-designed worksheet.
Lesson Plan
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Crop Circles

For Teachers 5th - 8th
Students calculate the area and circumference of a circle. In this geometry instructional activity, students solve word problems with circles and create formulas to calculate the area. They find the rate and complex area of a circle.
Lesson Plan
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Diameter, Radius and Area

For Teachers 9th - 10th
Students calculate the diameter, radius and area of a circle. In this geometry lesson, students investigate the different ratios of a circle. They calculate the surface are of each circle.
Lesson Plan
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Equations of Circles

For Teachers 10th - 12th
Students will define circle and radius. In this radius lesson,  students are given a circumference, they will write an equation and sketch the circle. Students will match graphs of circles to their equations.   
Lesson Plan
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Shapes...the Beginning of Geometry

For Teachers K - 1st
Students identify and name basic shapes and points. In this elementary geometry lesson, students use printable cut outs to name circles, triangles, and squares before playing a game with them. They play a game of "Pin the Tail on the...
Interactive
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Segment Formulas Multiple Choice

For Students 10th
In this geometry activity, 10th graders use the theorems regarding circles and tangents to find the indicated missing segment length.  The one page interactive activity contains ten problems.  Answers are included. 
Organizer
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Chomping Word Choice

For Students 2nd - 4th
In this word choice worksheet, students put words in the circles that would be good word choice for them to use. Students put words into 11 circles.
Worksheet
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Arcs and Chords

For Students 9th - 10th
In this circles worksheet, students find missing arc lengths and chords.  Students also find the length of radii in three problems.
Interactive
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Basic Geometry Vocabulary

For Students 10th
In this geometry activity, 10th graders match basic vocabulary words relating to angles, circles, quadrilaterals, and transformations in a drag and drop game format.  The one page interactive activity contains twenty matching...
Lesson Plan
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Ara of Circles

For Teachers 8th - 10th
Students identify the differentiate the different properties of circles and parallelograms. In this geometry instructional activity, students calculate the area of each solid and identify the formula. They relate Pi to the circumference...
Lesson Plan
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Arc Length - Horse

For Teachers 9th - 12th
Students define an arc and calculate its length. In this geometry lesson, students find examples of arc in the real world. They show their understanding of arcs through problem solving.