→ 0.9250 * (-0.1736) = -0.1606
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Step 3: Compute using log tables (or calculator). sin 38° = 0.6157 sin 68° = 0.9272 a = (12 * 0.6157)/0.9272 = 7.3884/0.9272 ≈ 7.97. sin 38° = 0
Spherical law of cosines for sides: cos c = cos a * cos b + sin a * sin b * cos C cos c = cos70° cos80° + sin70° sin80° cos100° C = 180° - (38°+74°) = 68°
cos c = 0.0594 - 0.1606 = -0.1012
Given: A=38°, B=74°, c=12 (side opposite C). Step 1: Find C. C = 180° - (38°+74°) = 68°.