Exercises: Apply the Law of Sines and the Law of Cosines

Grade 10·22 problems·~35 min·Common Core Math - HS Geometry·standard·hsg-srt-d-11

Work through problems with immediate feedback

Recall / Warm-Up

A triangle has two sides and the included angle known (SAS). Which law should you use first to find the missing side?

Law of Sines, because you have two ratios to compare

Law of Cosines, because the known angle is between the two known sides

Pythagorean Theorem, because any triangle can be split into right triangles

Either law — they always give the same answer