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Sindrei [870]
3 years ago
9

Geometry ( WILL GIVE BRAINY)

Mathematics
2 answers:
Step2247 [10]3 years ago
8 0

Answer:

1:

we have a rule that is (n-2)×180

while n = number of sides

2:

exterior angle of a polygon = 360 ÷ number of sides

so 360÷25=14.4

3:

octagon is 8 side, so as we said: (8-2)×180 = 1080

4:

lets make an equation, we know that (n-2)×180 = the sum

so (x-2)×180=720

180x -360 = 720

180x = 1080

x=6

dedylja [7]3 years ago
5 0

Answer:

(x-2)×180=720

180x -360 = 720

180x = 1080

x=6

Explanation:

Trust! :)

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