3 years ago

Please help ASAP Please thank you

1 answer:

5 0

To find the sum of all internal angles of a polygone, we apply the following formula:
∑of all interior angles = ( n-2) x 180°, where n is the number of sides
Octogone =(8-2)x 180=1080°
Now add up all the given angles:
130+163+104+126+153+107+131+x = 1080
x= 166°

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