∠CMD = 90°
∠NMD = 4/5 × ∠CMD ⇒ NMD = 4/5 × 90 = 72°
∠CMN = ∠CMD - ∠NMD = 90 - 72 = 18°
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∠CMD = 90°
∠NMD = 4/5 × ∠CMD ⇒ NMD = 4/5 × 90 = 72°
∠CMN = ∠CMD - ∠NMD = 90 - 72 = 18°
Ответ: ∠CMN = 18°.