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06-09-2018
Mathematics

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What is the value of x?
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What is the value of x Enter your answer in the box class=

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13-09-2018

It's a heptagon.

The formula of the sum of internal angles in the polygon:

[tex]S=(n-2)\cdot180^o[/tex]

Therefore

[tex]120^o+158^o+126^o+125^o+121^o+139^o+x^o=(7-2)\cdot180^o\\\\789^o+x^o=900^o\ \ \ \ |-789^o\\\\x^o=111^o[/tex]

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