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Lesson Plan
Curated OER

Finding the Area of Regular Polygons

For Teachers 9th - 12th Standards
Students analyze relationship between the increase in polygons sides and a circle. In this geometry lesson, students relate the size of the central angle of a polygon, to a circle. They compare the formula for the area of a polygon and a...
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Lesson Plan
Curated OER

Inscribing a Circle in a Triangle

For Teachers 9th - 12th Standards
Pupils investigate inscribing a circle in a triangle. They use Cabri Jr. to draw a triangle, locate the incenter, and use the distance from the incenter to a side of the triangle to inscribe a circle. The dynamic nature of the geometry...
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Worksheet
Curated OER

Area of a Circle

For Students 10th
For this geometry worksheet, 10th graders are asked to calculate the area of a circle given the radius of the circle. There is an answer key for these 9 problems.
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Lesson Plan
Curated OER

Areas and Volumes

For Teachers 10th
Tenth graders calculate the area and the volumes of polygons. In this geometry instructional activity, 10th graders review the formulas used to solve for the area and volume and explain to the class how they arrived at their answer. They...
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Lesson Plan
Curated OER

Circles

For Teachers 10th
Tenth graders explore and define the radius and diameter of a circle. In this geometry lesson, 10th graders calculate the circumference and area of a circle using real world objects and shapes. They discuss chords and lines tangent to a...
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Lesson Plan
Texas Instraments

Angles in Circles

For Teachers 9th - 12th Standards
Teach your learners how to investigate the relationship between a central angle and an inscribed angle which subtend the same arc of a circle. The dynamic nature of Cabri Jr. provides opportunity for conjecture and verification.
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Lesson Plan
Curated OER

My Hero Learning Circle

For Teachers K - Higher Ed
Students participate in a collaboration activity. In this My Hero Project lesson, students discover what a hero is to someone halfway around the world and themselves. Over the 16-week session, circles, made up of between 6-9 classes from...
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Worksheet
Curated OER

Surface Area

For Students 10th
In this geometry instructional activity, 10th graders define surface area, net and lateral face. They calculate the surface areas of cones, prisms and cubes. There are 9 surface area questions.
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Worksheet
Curated OER

Extra Practice 7.1: Properties of Exponents

For Students 9th - 12th
For this properties of exponents worksheet, students multiply and divide terms with variables and exponents.  They find the area of triangles and circles.  Students determine the volume of given shapes.  This two-page worksheet contains...
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Lesson Plan
Curated OER

Reading in the Content Area-Leeches

For Teachers 6th
Learners practice the habits of good readers in the content area of science. While reading a brief article about leeches, they compare and contrast the material read with other information they have encountered.
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Lesson Plan
Curated OER

The Circle's Measure

For Teachers 3rd - 7th
Students explore circumference and diameter. For this math lesson, students apply their knowledge of circumference and diameter to solve mathematical riddles. Students apply this knowledge to find circumference and diameter of various...
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Lesson Plan
Curated OER

Circumference and Area of Circles

For Teachers 5th - 6th
In this math worksheet, learners learn to calculate the area and circumference of a circle. Students answer 4 word problems after reading the information and studying the examples.
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Lesson Plan
Curated OER

Square Circles

For Teachers 6th - 7th
Students analyze and demonstrate how a circle can be measured in square units and examine how diameter, circumference and radius are related.
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Worksheet
Curated OER

Math Practice: Circles

For Students 4th - 6th
In this circle worksheet, students solve 8 problems: finding percentage increase, finding differences in area and perimeter, finding circumference and area.
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Lesson Plan
Curated OER

Moving On: Octagoning the Circle

For Teachers 3rd - 8th
Students explore circles through the use of octagons. They inscribe a circle in a regular octagon and find the area and perimeter of the hexagon with respect to the radius of the circle. Students present their findings to the class.
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Lesson Plan
Curated OER

Area graphics for 7th graders

For Teachers 6th - 7th
Students randomly select dimensions for three geometric shapes (square, right triangle and circle). From the graphs they compare and contrast the graphical results of each shape.
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Worksheet
Curated OER

Perimeter, Circumference and Area

For Students 9th - 11th
In this measurement learning exercise, students identify the area, perimeter and circumference of a diagram. They also find the size of a pond based on the diagram shown on the sheet. Finally, students calculate how much carpet is needed...
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Lesson Plan
Curated OER

Geometry: Area

For Teachers 2nd - 6th
Students visit various websites to calculate the area of circles, triangles, rectangles, trapezoids, and parallelograms. They explore math problems and play interactive games dealing with geometry.
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Lesson Plan
Curated OER

Perimeter and Area of 2D Shapes

For Teachers 6th - 7th
Pupils find the perimeter and area of circles, triangles, and rectangles. In this perimeter and area lesson, the teacher gives students formulas for each shape and measurement and works through examples on the board. While no creative...
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Lesson Plan
Curated OER

Evaluating the Products of Chords of a Circle

For Teachers 9th - 12th Standards
Students investigate chords and make predictions. In this geometry instructional activity, students graph circles and calculate the measurement of each chord. They perform the calculations and make conjectures.
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Lesson Plan
Curated OER

Volume, Surface Area for Cylinders

For Teachers 7th
Seventh graders explore the concept of volume and surface area of cylinders. In this volume and surface area of cylinders lesson, 7th graders break cylinders into their base shapes of a circle and a rectangle. Students discover that...
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Lesson Plan
Curated OER

Circulatory Circles

For Teachers 4th - 7th
Students investigate the circulatory system. In this circulatory system lesson, students complete a WebQuest and explore all the areas of the heart. Students determine the functions of different parts of the circulatory system and...
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Worksheet
2
2
K12 Reader

Shapes on a Plane

For Students 2nd - 3rd Standards
Geometric shapes are the focus of a comprehension exercise that asks readers to examine a short passage about planes, circles, triangles, and rectangles, and then to respond to a series of questions about the article.
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Activity
Pie Council

National π Day

For Teachers 4th - 8th Standards
Learners can enjoy pi with pie! A collection of short activities celebrates pi day with a word search, a maze, and real-world problemsn. Using pi in formulas for area, circumference, and volume as well as exploring simple fractions is...

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