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Polygon Calculator
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Calculate Regular Polygon
Parameters
Values
Number of sides
Length of one side (inches)
Significant figures
Calculate
Results
Perimeter
0.00 Inches
Each interior angle
0.00 Degrees
Interior angle (Sum)
0.00 Degrees
Each exterior angle
0.00 Degrees
Each central angle
0.00 Degrees
Circumradius
0.00 Inches
Inradius
0.00 Inches
Total area
0.00 Inches
Regular Polygons
This calculator works
only
for
regular polygons
- those which have
ALL sides equal and ALL interior angles equal.
The above figure shows a
regular polygon
.
The outer circle surrounding it is called a
circumscribed circle (or circumcircle)
and the inner circle which is surrounded be the octagon is called the
inscribed circle (or incircle)
.
Angle EAB is one of the 8
interior angles
.
Angle EAF is one of the 8
exterior angles
and equals
central angle ACB
.
Line AC is called the
circum radius
(the radius of the outer, circumscribed circle).
Line CD is called the
inradius
(the radius of the inscribed circle).