Question

[Nguyễn Quang Hoàng]

tam giac ABC co goc A=90 do ve ra ngoai tam giac ABC cac tam giac deu ABD va ACE, BE cat CD tai I. CMR:

a)BE=CD

b)tam giac BDE can

c)goc EIC=60 do va IA la P/G cua goc DIE