It seems like you're looking for the radius of a cone, but the information provided doesn't specify the dimensions or context needed to determine the radius.
If you have a particular problem or formula in mind (like the formula for the volume or surface area of a cone), please provide additional details, and I can help you figure it out. Otherwise, from the responses you've given (4, 12, 8, 10), any of those could potentially be the radius, but we would need more information to confirm which one is correct.