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Lesson Plan
Curated OER

Incenter of a Triangle

For Teachers 10th
Tenth graders find the incenter of a triangle. In this geometry instructional activity, 10th graders define the way to create an incenter with an angle bisector. They differentiate between incenter and incircle.
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Lesson Plan
Curated OER

Infinite Secrets

For Teachers 9th - 12th
Students duplicate the method that Archimedes used to estimate the value of pi. They complete a data table and find the approximate values of pi for three sets of polygons.
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Lesson Plan
Curated OER

Get In Line!

For Teachers 9th - 12th
High schoolers compare and order fractions and decimals using a number line. They use rules of conversion to determine equivalencies competing problems accurately and plot points on the number line that represent the correct order of the...
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Lesson Plan
Curated OER

Putting the 'pi' in Pumpkin Pie

For Teachers 8th - 10th
Students use geometric formulas to divide a pumpkin pie. In this geometric formulas lesson, students review equations for area and circumference of a circle and divide a pumpkin pie to practice the formulas. Students use the Pythagorean...
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Lesson Plan
Curated OER

Plain Figures and Measuring Figures

For Teachers 10th - 12th
Students investigate basic geometric concepts. In this geometry activity, students explore solids through measuring and modeling. This assignment models the importance of understanding concrete objects in geometry.      
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Worksheet
Curated OER

The Harry Potter Problem

For Students 9th - 12th
In this Harry Potter activity, students read a portion of an inscription from the book.  Students use logic to determine the contents of the seven bottles described in the paragraph.  This one-page activity contains 1 logic problem.  The...
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Worksheet
Curated OER

Word Problems

For Students 9th - 10th
In this geometry learning exercise, students read a scenario and translate it using geometric concepts to find their answers. There are 15 questions with an answer key.
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Lesson Plan
Curated OER

Circle Conjectures

For Teachers 9th - 11th Standards
Students are given diagrams and are asked to make a conjecture. In this geometry lesson, students make conjectures of circles. They complete a lab activity to reinforce making conjectures. The first activity addresses a common core...
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Lesson Plan
Curated OER

Area of Triangle using the Semi-Perimeter and Radius

For Teachers 8th - 10th
Students investigate the properties of circles. In this geometry lesson, students calculate the area and perimeter of a triangle. They identify the perimeter and radius length of a circle.
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Lesson Plan
Curated OER

Finding Pi

For Teachers 9th - 12th
Students participate in a hands-on activity with popcorn and a calculator in order to determine pi.
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Lesson Plan
Curated OER

Math: Tangents

For Teachers 9th - 10th
Students discover how to recognize tangents and how to use their properties. They investigate and use the properties of angles, arcs, chords, tangents, and secants. Students use two tangents and the properties of similar triangles to...
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Lesson Plan
Curated OER

Hexagoning the Circle

For Teachers 6th - 9th
Students explore similarity to see that the area of a circle should be a constant times the square of its radius. Students create a hexagon. Students share their designs with the class.
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Lesson Plan
Curated OER

Exploring Centers of a Triangle: Part 1

For Teachers 9th - 11th
Students use problem solving skills, formal geometry, and The Geometer?s Sketchpad. They model and solve two real-world problems by constructing the in center and circumcenter of triangles.
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Worksheet
Curated OER

Special Segments is a Triangle

For Students 10th
In this geometry worksheet, 10th graders examine the special segments that occur in a triangle.  The three page worksheet contains twenty-five problems.  Answers are not included. 

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