证明:
易得∠DHE=∠CHF=60°(对顶角相等)
∵AB∥CD
∴∠EKG=∠DHF=60°
∴∠EGK=180°-(∠EKG+∠KEG)
=180°-90°=90°
故△EKG是直角三角形.
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证明:
易得∠DHE=∠CHF=60°(对顶角相等)
∵AB∥CD
∴∠EKG=∠DHF=60°
∴∠EGK=180°-(∠EKG+∠KEG)
=180°-90°=90°
故△EKG是直角三角形.
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