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each exterior angel of a regular polygon is 40. 1.how many sides does the polygon have?

2. work out the size of an inerior angel in this polygon


Each Exterior Angel Of A Regular Polygon Is 40 1how Many Sides Does The Polygon Have2 Work Out The Size Of An Inerior Angel In This Polygon class=

Răspuns :

The size of an interior angle is 180° - 40° = 140°

If  n = the number of angles (= the number of sides), we have:

[tex]\it \dfrac{(n-2)\cdot180^o}{n}=140^o \Rightarrow \dfrac{n-2}{n}=\dfrac{\ 140^{(20}}{180}=\dfrac{7}{9} \Rightarrow n=9\\ \\ \\ So,\ \ the\ \ polygon\ \ have\ \ 9\ \ sides[/tex]