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Work Shown
sin(angle) = opposite/hypotenuse
sin(Ꮎ) = 52.1/78.3
sin(Ꮎ) ≈ 0.66538953
Ꮎ ≈ sin⁻¹(0.66538953)
Ꮎ ≈ 41.71221601°
Ꮎ ≈ 41.7°