Which set of ordered pairs is a function ​

Could someone me with this question i’ve been stuck on it for 20 minutes

Which of the following is true about the following construction of a tangent to a circle from a point outside of the circle?

Andy wants to find the distance d across a river. he located points as shown in the figure, then use similar triangles to find that d = 223.5 feet. how can you tell without calculating that he must be wrong? tell what you think he did wrong and correct his error. round your answer to the nearest tenth if necessary. andy must have used the wrong . the distance d is actually feet.