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heptagon
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A heptagon is a
polygon
with 7 sides. The sum of the interior angles of a polygon is 900°. In the case of a regular heptagon, each interior angle is approximately 128.57°.
The area of a regular heptagon of side length
a
is (7/4)a
^{2}
cot(π/7).
Related category
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POLYGONS
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