+0  
 
0
101
2
avatar

https://vle.mathswatch.co.uk/images/questions/question17074.png

Guest Jun 25, 2018
 #1
avatar
+2

360 - 72 =288 degrees - sum of the other angles.

288 /2 = 144 degrees - one interior angle of the polygon.

180(n - 2)/n = 144 degrees, where n = number of sides of a polygon.

180(n - 2) = 144n

180n - 360 = 144 n

180n - 144n = 360

36n = 360

n = 360/36

n = 10 - Number of sides of a polygon, or a decagon.

Guest Jun 25, 2018
edited by Guest  Jun 25, 2018
 #2
avatar+9677 
+2

144°+144°+72°=360°

laugh

Omi67  Jun 25, 2018

13 Online Users

avatar

New Privacy Policy

We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive information about your use of our website.
For more information: our cookie policy and privacy policy.