Answer:
I got x= 19.6
Step-by-step explanation:
Answer:
83/24
Step-by-step explanation:
Calculator.
There will be 18 exterior angles, each of 360/18 = 20 deg. So each interior angle, which is supplementary to the exterior angle will be 180–20 - 160 deg. The sum of the 18 interior angles = 18*160 = 2880 deg.