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Cópia de Exterior Angles of Polygons

Clique no botão "▶". Observe os ângulos que o carro gira em cada vértice.
1. What is a + b + c + d + e, the total angles turned by the car? 2. a, b, c, d, e are called the exterior angles of the convex pentagon.   In general, what is the sum of all exterior angles of a convex polygon? 3. How would you modify the result if the pentagon is NOT convex? Anthony Or. GeoGebra Institute of Hong Kong.