🔍 Key Concepts

• Common naval architecture symbols for displacement, draft, and angles • Use of Greek letters like Δ and θ in stability problems • Difference between a quantity itself and a change in that quantity (e.g., draft vs change of draft)

💭 Think About

• Look at symbol #1: what kind of letter or shape is it, and is it solid or just an outline? • In ship‑stability formulas, when you see this symbol by itself (not attached to another letter), what physical ship property does it usually represent? • Which option describes a basic ship property that is often given as a single value for the whole vessel, not a direction or an angle?

✅ Before You Answer

• Verify which option is the standard meaning of the capital Greek delta (Δ) in naval architecture texts and stability problems. • Check that the symbol for angle of inclination usually looks different (often φ or θ) from the one shown. • Confirm that centerline is normally written with letters (e.g., CL) rather than this triangular symbol.