The tips for this question are all home! Prompted to say △ABE∽△DAE, you should be able to prove this, right? In the future, the certificates are almost the same, and there will be AE? =BE×ED
Given AE = root number three, then we also neED to know the size of be and ed! Given OE: ED = 1: 3, if the OE length is x, the ED length is 3x. OB=OD=ED-OE=2x, EB = ob-OE = X. Can you get the root number three? =x×3x, x = 1, then BD = 4x = 4.
I don't know if I made it clear, I hope I can help you O(∩_∩)O~