Question

which is a property of an angle?
○ has two sides that each extend forever in both directions
○ has two endpoints
○ has two center points
○ has two rays that share a common endpoint

Explanation:

• An angle is defined as two rays (which extend infinitely in one direction) sharing a common endpoint (the vertex).
• "has two sides that each extend forever in both directions" describes a line, not an angle.
• "has two endpoints" describes a line segment, not an angle.
• "has two center points" is not a property of an angle.

Answer:

has two rays that share a common endpoint