Apply the Laws of Sines and Cosines to find unknown measurements in right and non-right triangles.
Round and interpret a triangle measurement to explicit precision
Problem
Round a navigation distance of \(12.438~\text{km}\) to the nearest tenth of a kilometer and interpret the result.
Big Picture
What this problem is really about
Keep the triangle calculation at full precision until the final reporting step. Identify the requested last place, inspect only the digit immediately to its right to round, and retain the original measurement units. In the contextual sentence, language such as “about” signals that the reported value is an estimate at the stated precision.
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