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Formula used: Law of Cosines
c² = a² + b² − 2ab·cos(C)
Step 1: Substitute a=5, b=7, C=60°
c² = 25 + 49 − 2(5)(7)cos(60°)
c² = 74 − 70(0.5) = 39
Answer: c = √39 ≈ 6.245
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Geometry Calculator provides free, instant solutions for every geometry problem you encounter in high school and college mathematics. Our suite of 70+ specialized calculators covers triangles, quadrilaterals, circles, polygons, coordinate geometry, 3D shapes, and formal geometric proofs.
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