Question

Please answer this fast and correct and if you do you i will mark you brainliest
THIS ONE MIGHT BE HARD THE THE WINNER WOULD GET FOLLOWED AND BE MARKED AS BRAINLIEST and if you even get it correct that shows your smart

Answer 1

Answer:

18

Step-by-step explanation:

we can use the formula

180(n-2) where n is no. I of sides

$180(n - 2) = 180 \times 20 \\ n - 2 = 20 \\ n = 18$