• Aturan sinus

    a/sin A = b/sin B
    sin A = a. sin  B / b
    sin A = (30)(sin 30) / (15)
    sin A = 30( 1/2) / 15
    sin A = 1
    A = 90°
  • a/sin A = b/sin B
    30/sin A = 15/sin 30
    15 sin A = 30 sin 30
    sin A = 15/15
    <A = 90°