On a dartboard, what number is directly opposite No. 1?

On a standard dartboard, the numbers are arranged in a specific pattern. The number 1 is located at the top of the board, and if we imagine a straight line going through the center of the board, the number directly opposite to the number 1 would be the one located at the bottom. Going in a clockwise direction from 1, the number sequence leads to 19 as the next number when we reach the bottom. Hence, 19 is the number that is directly opposite to number 1 on a dartboard.