🔍 Key Concepts

• Standard rule-of-thumb formula for breaking strength of manila line in pounds based on diameter in inches • Difference between circumference and diameter of line, and which one the common formula uses • How a 4-inch manila line compares in strength to smaller common sizes (like 1-inch or 2-inch)

💭 Think About

• Ask yourself: does the standard formula use the diameter of the line or the circumference? How would that change the number a lot? • Estimate the breaking strength of a 1-inch manila line using the rule-of-thumb, then think how many times stronger a 4-inch line should roughly be. • Compare each option to what you’d expect for a heavy mooring line—are any answers obviously too low to be realistic for 4-inch manila?

✅ Before You Answer

• Be sure you are plugging 4 inches as the correct measure (diameter vs. circumference) into the formula used in your license prep materials. • Check that the units of the formula give you pounds of breaking strength, not safe working load (which is much lower). • After computing, compare your result with the choices and pick the closest realistic value for a large manila line.