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Дано: Треугольник АВС. АВ=ВСб М∈BD, K∈AC. MK║AB. <ABC=126°,<BAC=27°.

Найти <MKD, <KMD и <MDK.

Решение.

Треугольник АВС равнобедренный, следовательно BD - биссектриса, высота и медиана треугольника. <BAC=<BCA=27°, Значит

<ABD = (1/2)*(<ABC) = 126/2 = 63°. <BDA=<MDK = 90°.

MK параллельна АВ, значит <MKD=<BAC=27°, а <KMD=<ABD=63°, как соответственные углы при параллельных прямых АВ и МК и секущих AD и BD соответственно.

ответ: <MKD=27°, <KMD=63°, <MDK=90°.