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How do you find the measure of an angle for a triangle with the sides of 125.1, 73.7 and 80.6?

 Jun 25, 2020
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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

 Jun 25, 2020

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