Texas Instruments
Area of Circles
High schoolers explore circles. In this algebra/geometry lesson, students discover the formula for the area of a circle, as they investigate the ratio of the area of a circle to the radius^2.
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Circles
A very basic presentation on the vocabulary associated with circles has come around. Math whizzes see definitions and examples of the radius, diameter, chord, and central angle of a circle. The last slide says "practice time," but there...
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Portrait of a First Grader
First graders generate ideas of the things that a 1st Grade student thinks, does and feels based on a model on bulletin board paper. They (counselors) pick one students and trace that student's body onto a pieces of bulleting board paper...
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Altitudes and Orthocenters: Making Connections to the Nine-Point Circle
Young scholars practice various equations for constructing nine-point circles for triangles.
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History and the Approximations of pi
Middle schoolers investigate Pi. In this mathematics lesson, learners discuss the history of Pi and determine how the approximation of Pi was discovered.
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MCC - 1106 Word Search
Use this geometry instructional activity to have learners locate and identify various vocabulary terms related to mathematics. There are seven words/phrases located in the puzzle.
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Recognize and Draw Shapes Word Problems
It's time for a geometry warm up! Geometry scholars examine a figure to determine its name from a list of four choices. The figure, a trapezoid, is large enough for the whole class to see if you were to project this. An explanation at...
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Making Two-Dimensional Shapes
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...
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Skills Practice: Area of Circles
Two practice pages with 10 problems each show circles and give their radii. Learners calculate the area. Answers are provided.
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Circles to Spheres
Students investigate circles and spheres. In this space shapes instructional activity, students compare and contrast two-dimensional and three-dimensional shapes. Students investigate the relationship between plane and space shapes.
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As The World Curves
Pupils 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.
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Measuring the Diameter of the Sun
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.
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Geometry
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.
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Circumference of Circle Worksheets
In this online math instructional activity, 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...
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Word Problems that involve Circles
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!
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Geometry Worksheets - Volume of Cylinders
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...
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Word Problems that involve Circles
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.
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Area of Shaded Regions that involve Circles
In this online math worksheet, high schoolers 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...
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Circle Problems - Radius, Diameter, Circumference and Area
In this online math 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 difficulties. A...
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Radius, Diameter and Area
Students 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.
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Discovering Pi
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.
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What Is A Ratio?
In this math worksheet, students complete 9 problems where they find ratios of letters in a box and shaded circles of a group. Examples are given in this well-designed worksheet.
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Crop Circles
Students calculate the area and circumference of a circle. In this geometry lesson, students solve word problems with circles and create formulas to calculate the area. They find the rate and complex area of a circle.
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Diameter, Radius and Area
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.