Precalculus · F-TF
Law of Sines — Solve Oblique Triangles
a/sin A = b/sin B = c/sin C. Use Law of Sines when you know a side and its opposite angle (AAS, ASA, SSA).
PrecalculusCommon Core HSG-SRT.D.10F-TFVerified correct ✓
Worked examples
In triangle ABC, angle A = 45°, angle B = 90°, and side a = 18. Use the Law of Sines to find side b. Round to 4 decimal places.
Answer: 25.4558
In triangle ABC, angle A = 40°, angle B = 60°, and side a = 16. Use the Law of Sines to find side b. Round to 4 decimal places.
Answer: 21.5567
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