Polygon Angle Sum
Derive the sum of the angles of a polygon by dividing the polygon into triangles and summing their angles. Vary the number of sides and determine how the sum of the angles changes. Dilate the polygon to see that the sum is unchanged.
Launch GizmoPolygon Angle Sum
Derive the sum of the angles of a polygon by dividing the polygon into triangles and summing their angles. Vary the number of sides and determine how the sum of the angles changes. Dilate the polygon to see that the sum is unchanged.
5 Minute Preview
Use for 5 minutes a day.
LESSON MATERIALS:
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User Lesson Materials (showing 5 of 10):
Exploration par l’étudiant: La Somme des Angles d’un Polygone
version français
Best For:
Geometry, Geometry
Vocabulaire: La Somme des Angles d’un Polygone
version française
Best For:
Geometry, Geometry
Vocabulario: Suma de Ángulos del Polígono
Vocabulario en español.
Best For:
Geometry, Geometry
Ejercicio Práctico del Alumno: Suma de Ángulos de Polígono
Ejercicio Práctico del Alumno en español.
Best For:
Geometry, Geometry
Polygon angle Sum
Exploration Guide reformatted and refocused for The Ontario Grade 9, especially the Applied.
Best For:
Geometry, Geometry
Show Remaining Lesson Materials (5)
User Recommendations (5):
Gives a quick"A ha" moment. Diminished reliance on formula
Recommended for: Math 6, Math 7Gizmo User from Virginia
This Gizmo helps students to arrive at their own conclusions and the table maker helps them organize their data.
Recommended for: Math 6, Math 7Gizmo User from Ontario
Really nice visualizations that lead to angle sum formulas
Recommended for: Math 6, Math 7Gizmo User from Virginia
A great Gizmo that allows students to discover the formula n-2(180) on their own and lead to the "a-ha" moment.
Recommended for: Math 6, Math 7Gizmo User from Kansas