Which statements must be true about the reflections of ΔXYZ across ↔MN? Select 3 options. M∠X'Z'Y' = 90°
M∠MCY = 90°
Line XX' ≅ line YY'
Line BZ' ≅ line BZ
Line BZ' ║line X'Y'

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since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.