We can tell this is an isosceles triangle due to the sticks meaning the base angles are equal so the measurement of ACB would be the same as ABC so it would measure x
Area = length * width
length = (2 * width) - 1

Since length cannot be negative, w = -2 is not a solution. Thus,

is your width.
Since length = 2 * width - 1, plug in width:
1/2 chance it will land on an even number
Explanation there is 4 even numbers and 4 odd numbers meaning it’s a 50/50 chance