Contact us
Choose a category below so we can get back to you as quickly as possible.
∵ABCD是梯形,DC||AB,AD=BC ∴ABCD是等腰梯形,則∠B=∠A ∵BD平分∠ABC,∠A=60° ∴∠B=60° ∠ABD=∠CBD=∠B/2=30° ∠ADB=90° ∴BD=AD/tag60°=2√3 /3
We and our partners use cookies and other technologies to analyze traffic and optimize your experience. View more info and control your cookies settings at any time in our Cookies Policy.