Polygons - Polygon basics

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A triangle can be in more than one plane at a time.
A heptagon has 7 sides and 6 angles.
The angles in a regular polygon are congruent.
The sum of the measures of the angles in a triangle is 180 degrees.
All polygons have four sides.
All quadrilaterals have four angles.
A pentagon can be separated into 3 triangles.
A triangle has only 2 vertices.