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The sum of the measures of the interior angles
The sum of interior angles of any polygon can be foud wuth the following general formula
Sum of interior angles = (n-2) \ times 180^{\circ}
where n is the number of sides
<u>1. Nonagon</u>
The Nonagon is a polygon with 9 sides. then,
n = 9
Sum of interior angles of Nonagon
=
=
=
<u>2.Pentagon</u>
The Pentagon is a polygon with 5 sides. then,
n = 5
Sum of interior angles of Pentagon
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=
=
<u>3. 11-gon</u>
The 11-gon is a polygon with 11 sides. then,
n = <u>11</u>
Sum of interior angles of 11-gon
=
=
=
<u>4. 18-gon</u>
The 18-gon is a polygon with 18 sides. then,
n = 18
Sum of interior angles of 18-gon
=<u></u>
=
=
<u>5. 38-gon</u>
The 38-gon is a polygon with 38 sides. then,
n = 38
Sum of interior angles of 38-gon
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=
=
<u>6.56-gon</u>
The 56-gon is a polygon with 56 sides. then,
n = 56
Sum of interior angles 56-gon
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