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?
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.
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.