How do you find the measure of an angle for a triangle with the sides of 125.1, 73.7 and 80.6?
Use the Law of Cosines to find the angles:
Obtuse scalene triangle.
Sides: a = 125.1 b = 73.7 c = 80.6
Area: T = 2820.592
Perimeter: p = 279.4
Semiperimeter: s = 139.7
Angle ∠ A = α = 108.257° = 108°15'26″ = 1.889 rad
Angle ∠ B = β = 34.019° = 34°1'9″ = 0.594 rad
Angle ∠ C = γ = 37.723° = 37°43'24″ = 0.658 rad
