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These free worksheets include two pages for students to name 2D shapes by identifying the number of sides and vertices. Shapes included: octagon, decagon, heptagon, hexagon, pentagon, circle, square (quadrilateral), and triangle. Need shape posters for word walls?

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Triangle Measurement Interactive Notebook Page - showing proof that the interior angles of a triangle have a sum of 180 degrees. So much better than just telling students. Show the proof.

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FREEBIE! This activity helps students discover the angle sum property of triangles by cutting off the angles of a triangle and pasting the vertices together, which meet to form a straight line (180°).

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How many triangles can you make with 9 sticks? Kids can reinforce geometry and critical thinking skills through creating various shapes with sticks.

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Here's a page for use with the book THE GREEDY TRIANGLE by Marilyn Burns. As the triangle changes its shape, students build each shape with marshmallows and toothpicks and record information about sides, angles, and vertices.

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The Howgill Fells are hills in Northern England between the Lake District and the Yorkshire Dales, lying roughly in between the vertices of a triangle made by the towns of Sedbergh, Kirkby Stephen and Tebay. The name Howgill derives from the Old Norse word haugr meaning a hill or barrow, plus gil meaning a narrow valley.

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Shape monsters---can incorporate shapes, vertices and adjectives all in one. Have the kids create their shape monster then describe it using math vocabulary and afjectives

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