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The sum of the interior angles of a polygon is obtained from the following equation.
[tex](n - 2) \times 180°[/tex]
In which n is the number of sides of the polygon.
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Thus ;
a ) 9 sides
Just need to put 9 instead of n in the above equation .
[tex](9 - 2) \times 180° = [/tex]
[tex]7 \times 180° = [/tex]
[tex]1260°[/tex]
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b ) 12 sides
Just need to put 12 instead of n in the above equation .
[tex](12 - 2) \times 180° = [/tex]
[tex]10 \times 180° = [/tex]
[tex]1800°[/tex]
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