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Coordinate plane word problems: polygons

Maria is sailing her ship back to her home island but wants to stop at a neighboring island along the way. Looking at her map (shown below), Maria knows her current location and the locations of both islands.
How much shorter would it be for Maria to go straight home instead of making the additional stop?
km\text{km}
Round your final answer to the nearest tenth of a kilometer. Do not round intermediate calculations.
Coordinate values are in kilometers.