Lesson Plan
Curated OER

Sum of Exterior Angles of Polygons

For Teachers 9th - 12th Standards
Have fun calculating angles for different polygons. The class differentiate the relationship between the interior and exterior angles of polygons. They discuss linear pair as it related the polygons and their angles. This is done as they...
Lesson Plan
Curated OER

Angles and Arcs

For Teachers 9th - 12th Standards
High schoolers identify the relationship between angles and arcs. In this geometry lesson, students rotate and move the circle around to create different arcs on the TI-Navigator. They differentiate between major and minor arcs.
Lesson Plan
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Triangle Congruence

For Teachers 9th - 11th
Students use web applet to create congruent triangles. In this geometry lesson, students differentiate between congruent and similar. They create shapes online and drag those shapes around to create visuals of triangles.
Lesson Plan
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Weight Game

For Teachers Pre-K - 2nd
Students estimate and compare grapefruit weights. In this weight measurement and literacy lesson, students listen to the story Nate's Big Hair and the Grapefruit in There, then estimate the weight of a grapefruit after holding it....
Lesson Plan
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Corresponding Sides and Angles of Similar Triangles

For Teachers 9th - 10th
Students differentiate between corresponding sides ad angles of two triangles. In this geometry instructional activity, students identify the differences as well as the similarities between two triangles. They differentiate between...
Lesson Plan
Curated OER

Why can't We Use SSA to Prove Triangles Congruent?

For Teachers 9th - 10th
Students investigate triangles and congruences. For this geometry lesson, students differentiate between inductive and deductive reasoning. They differentiate between similar and congruent triangles.
Lesson Plan
Curated OER

Exploring Special Lines

For Teachers 9th - 10th
Students compare and order numbers. In this geometry instructional activity, students write equations for inequalities. They differentiate and apply concepts of triangular properties to solve problems.
Lesson Plan
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Menelaus' Theorem

For Teachers 9th - 10th
Students investigate Menelaus Theorem. In this geometry lesson, students calculate the area of polygons. They differentiate between boundaries point, interior points and area of lattice points.
Lesson Plan
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Special Right Triangles

For Teachers 9th - 10th
Students identify different types of special right triangles. In this geometry lesson plan, students differentiate between right triangles and isosceles triangles. they construct the triangles using geometry software and make conjectures...
Lesson Plan
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Incenter of a Triangle

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

For Teachers 9th - 10th
Students identify and use the similarity theorem. In this geometry lesson, students differentiate between congruent and similar triangles. They solve problems using the computer modifying shapes by dragging.
Lesson Plan
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Similar Triangles on the Coordinate Plane

For Teachers 9th - 10th
Students investigate triangles and their properties. For this geometry lesson, students differentiate between similar and congruent triangles. They use the SSS theorem to help identify the triangles that are similar or congruent.
Lesson Plan
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Investigating Area and Perimeter of Polygons.

For Teachers 8th - 10th
Student sinvestigate the area and perimeter of polygons. They differentiate between similar and congruent polygons.. They identify the ratio and proportions of the sides and angles of polygons.
Lesson Plan
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Triangles with Collinear Circumcenters

For Teachers 9th - 10th
Learners identify the circumcenter of a triangle. For this geometry lesson, students construct a perpendicular bisector using a straight edge and a compass. They differentiate between triangles and collinear points.
Lesson Plan
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Exploring Angle Pair Relationships

For Teachers 9th - 11th
Students investigate the relationship between angles of triangles. In this geometry lesson, students identify properties of right and non-right triangles. They differentiate between vertical and supplementary angles.
Worksheet
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Indirect Measurement

For Students 8th - 9th
In this geometry worksheet, students differentiate between direct and indirect measurements. They create a table with their findings. There are 9 questions.
Lesson Plan
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Circumscribed Polygons

For Teachers 9th - 10th
Young scholars investigate polygons and construct ferris wheels. In this geometry lesson, students create a circle and differentiate properties of circles and polygons. They compare the relationship between angles and circumscribed...
Lesson Plan
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Investigating Trigonometric Ratios Through Similar Right Triangles.

For Teachers 8th - 10th
49Pupils investigate the properties of right triangles. In this geometry lesson, students differentiate between similar and congruent triangles. They use the Pythagorean Theorem to find the missing angles and sides.
Lesson Plan
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Investigating Trigonometric Ratios Through Similar Right Triangles

For Teachers 9th - 10th
Young scholars identify similar and congruent right triangles. In this geometry lesson, students use trigonometric ratios to identify missing sides and angles of a triangle. They differentiate similar and congruent triangles.
Interactive
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Parallels and Quadrilaterals

For Students 9th - 10th
For this geometry worksheet, students identify the missing angles and sides of a quadrilateral. They differentiate between the different types of quadrilaterals. There are 20 questions with an answer key.
Lesson Plan
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Exploring the Slopes of Parallel and Perpendicular Lines.

For Teachers 8th - 10th
Students find the slopes for perpendicular and parallel lines. In this geometry lesson, students differentiate between parallel and perpendicular lines. They use Cabri software to create lines to compare.
Lesson Plan
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Pythagorean Theorem: Triangles and Their Sides

For Teachers 8th - 10th
Students investigate triangles and their relationship to each other. In this geometry instructional activity, students solve right triangles using the properties of the Pythagorean Theorem. They differentiate between right, acute,...
Lesson Plan
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Mass Measurement

For Teachers 7th - 9th
Middle schoolers explore geometry by completing a physics activity on-line. In this mass measurement lesson, pupils define the terms mass, volume, and density and identify their relationship with each other. They complete an on-line...
Lesson Plan
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Conic Sections and Locii

For Teachers 9th - 11th
Students differentiate between ellipse and hyperbola. In this algebra lesson, students graph and solve elliptical equations. They use the cabri program to create the different conics and move them around.