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:

Step1: Analyze the first option

An angle's sides are rays. Rays extend infinitely in one direction, not both. So “has two sides that each extend forever in both directions” is wrong.

Step2: Analyze the second option

An angle is formed by rays. Rays have one endpoint. An angle has a vertex (common endpoint of rays) but not two endpoints. So “has two endpoints” is wrong.

Step3: Analyze the third option

An angle has one vertex (a single point where the two rays meet). So “has two center points” is wrong.

Step4: Analyze the fourth option

By the definition of an angle, it is composed of two rays that share a common endpoint (the vertex). So “has two rays that share a common endpoint” is correct.

Answer:

has two rays that share a common endpoint