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Lesson Plan
Curated OER

Area and Perimeter

For Teachers 9th - 12th
Students participate in a hands-on activity that shows the independence of perimeter and area for simple irregular figures.
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Lesson Plan
Curated OER

Geometry and Tony Smith Sculpture

For Teachers 6th - 8th
Middle schoolers respond to Tony Smith's sculpture as art and brainstorm about math concepts inherent in his work. They create a sculpture with polyhedra nets, calculate the cost of covering sculpture in gold, and write an exhibit label...
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Lesson Plan
Curated OER

Let's Tesselate

For Teachers 3rd - 4th
Learners investigate the geometrical concepts of translation, reflection, and rotation. They make different observations looking for the concepts that are displayed in classroom items like floor tiles, carpet designs, and visuals hung in...
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Lesson Plan
Better Lesson

Better Lesson: Finding Arrays in an Irregular Polygon

For Teachers 3rd
Third graders decompose an irregular polygon into arrays to find the area.
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Unit Plan
Cuemath

Cuemath: Regular Polygon

For Students 9th - 10th Standards
Introduces the concept of regular polygons along with regular polygon examples, not regular polygons, irregular polygons, and area of a regular polygon. Check-out the solved examples for better understanding and try your hand at solving...
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Lesson Plan
Better Lesson

Better Lesson: Area of Irregular Polygon

For Teachers 3rd Standards
Third graders look for break apart irregular polygons to make arrays to find the area of these common shapes.
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Unit Plan
Math Is Fun

Math Is Fun: Area of Irregular Polygons

For Students 9th - 10th Standards
Learn how to use coordinates to calculate the area of an irregular polygon.
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Lesson Plan
Better Lesson

Better Lesson: Area in Real Life With Irregular Polygons

For Teachers 3rd Standards
Dividing an irregular shape into rectangles helps students find the area of an irregular shape.
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Handout
Math Open Reference

Math Open Reference: Polygons

For Students 9th - 10th
Get the definition and properties of a polygon. Then explore such topics as: 1) types of polygon 2) area 3) Perimeter 4) angles associated with polygons and 5) names of polygons.
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Unit Plan
Math Is Fun

Math Is Fun: Properties of Regular Polygons

For Students 3rd - 8th
Find a definition of regular polygon, and learn how to calculate the internal angle, external angle, and number of diagonals of a regular polygon. Also, learn how to find the area of regular polygons.
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Whiteboard
ClassFlow

Class Flow: Area

For Teachers 3rd - 5th
[Free Registration/Login Required] This flipchart teaches students how to find the area of an irregular polygon.
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Unit Plan
CK-12 Foundation

Ck 12: Geometry: Area of Regular Polygons

For Students 9th - 10th
[Free Registration/Login may be required to access all resource tools.] This concept teaches students to calculate the area and perimeter of regular polygons. Students examine guided notes, review guided practice, watch instructional...
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Unit Plan
Khan Academy

Khan Academy: Area of Composite Shapes

For Students 5th - 7th Standards
Practice finding the areas of complex shapes that are composed of smaller shapes. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
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Unit Plan
Vernet -Virtual Education Resources Network

Salon Hogar: Referencia Rapida De Formulas Geometricas

For Students 9th - 10th Standards
This site provides the user with a useful reference to different geometric forms, their elements, formulas, and areas. Entirely in Spanish.
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eBook
Mathigon

Mathigon: Geometry: Polygons and Polyhedra: Quadrilaterals

For Students 9th - 10th Standards
This lesson focuses on quadrilaterals which can fall into multiple categories based on the number of sides and the angles.