a / sin A = b / sin B
a sin B = b sin A
sin B = b sin A / a
sin B = 84 sin 74⁰ / 126
B = 39•9 ⁰
sin(∠B)/b = sin(∠A)/a
sin(∠B) = 84 * sin(74°) / 126 = 2/3 sin(74°)
∠B = sin⁻¹(2/3 sin(74°)) ≈ 39.85°
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a / sin A = b / sin B
a sin B = b sin A
sin B = b sin A / a
sin B = 84 sin 74⁰ / 126
B = 39•9 ⁰
sin(∠B)/b = sin(∠A)/a
sin(∠B) = 84 * sin(74°) / 126 = 2/3 sin(74°)
∠B = sin⁻¹(2/3 sin(74°)) ≈ 39.85°