Final answer:
Three rays with endpoint K can be represented as KL, KM, and KN, where each ray starts at point K and extends indefinitely through another distinct point.
Step-by-step explanation:
In mathematics, a ray is a straight line that originates from a point and extends indefinitely in one direction. To answer the question about naming three rays with endpoint at K, we need to consider three different lines that start at point K and extend to three distinct points. Let's assume the points are L, M, and N. The rays can be represented as KL, KM, and KN. Each of these rays begins at point K and goes through another point, extending indefinitely beyond that point. It is important to note that while infinite rays could technically be drawn from a single point, the request here specifies just naming three distinct ones.