Janelle spots some dolphins in the ocean. Her father draws a diagram to show how far down they can go. How far is this relative to sea level? What would an altimeter read at this depth? not college middle school sorry

The relative is 1,000 below sea level. The altimeter should read -1,000.

Step-by-step explanation:

I really don't have a explanation, but I did that activity and this was the correct answer.

δabc ≅ δdcb by sas because

db ≅ ac . . given (side)

bc ≅ bc . . reflexive property (side)

∠dbc ≅ ∠ acb . . alternate interior angles where transversal bc crosses parallel lines bd and ac (included angle)