两边 $VA = VB$（对称），故等腰三角形，底角各 $（180^\circ - 60^\circ）/2 = 60^\circ$，

两边 $VA = VB$（对称），故等腰三角形，底角各 $（180^\circ - 60^\circ）/2 = 60^\circ$， - Treasure Valley Movers

📅 April 15, 2026 👤 scraface

Apr 15, 2026

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