Question

four angles of a pentagon are 100°,175°,85°and75°.Find the fifth angle.
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Answer 1

Step-by-step explanation:

formula of finding sum of all angles in a polygon is (n-2)×180 where n is number of sides

so ,

(5-2)×180=540

now substitute your value,

100+175+85+75+x=540

435+x=540

x=540-435

x=105

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Answer 2

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