The triangle is the most important polygon, because any polygon can be built from triangles. For example, the angle sum of any quadrilateral (polygon with four sides) can be worked out by cutting the quadrilateral into two triangles. Show that the angle sum of any quadrilateral is 27.

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The triangle is the most important polygon, because any polygon can be built
from triangles. For example, the angle sum of any quadrilateral (polygon with
four sides) can be worked out by cutting the quadrilateral into two triangles.
C
Show that the angle sum of any quadrilateral is 27.
A polygon is called convex if the line segment between any two points in
Plies entirely in P. For these polygons, it is also easy to find the angle sum.
Explain why a convex n-gon can be cut into n - 2 triangles.
Transcribed Image Text:The triangle is the most important polygon, because any polygon can be built from triangles. For example, the angle sum of any quadrilateral (polygon with four sides) can be worked out by cutting the quadrilateral into two triangles. C Show that the angle sum of any quadrilateral is 27. A polygon is called convex if the line segment between any two points in Plies entirely in P. For these polygons, it is also easy to find the angle sum. Explain why a convex n-gon can be cut into n - 2 triangles.
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