Пошаговое объяснение:
:
∠DMC = ∠DMK - ∠KMC = 90° - 65° = 25°
∠BMC = ∠DMB - ∠DMC = 51° - 25° = 26°
∠DMB + ∠KMC = 51° + 65° = 116°
Так как ∠DMB = ∠DMC + ∠BMC и
∠KMC = ∠KMB + ∠BMC, то
∠DMC + ∠BMC + ∠KMB + ∠BMC = 116°
Но ∠DMC + ∠BMC + ∠KMB = ∠DMK = 90°, получаем
90° + ∠BMC = 116°
∠BMC = 116° - 90° = 26°
Пошаговое объяснение:
:
∠DMC = ∠DMK - ∠KMC = 90° - 65° = 25°
∠BMC = ∠DMB - ∠DMC = 51° - 25° = 26°
:
∠DMB + ∠KMC = 51° + 65° = 116°
Так как ∠DMB = ∠DMC + ∠BMC и
∠KMC = ∠KMB + ∠BMC, то
∠DMC + ∠BMC + ∠KMB + ∠BMC = 116°
Но ∠DMC + ∠BMC + ∠KMB = ∠DMK = 90°, получаем
90° + ∠BMC = 116°
∠BMC = 116° - 90° = 26°