Nguyen Thuy Linh's Profile

dung

HAI DG TB CUA HINH THANG DO BAN

theo tc DTB  trong tam giac AHB suy ra MN//BH suy ra MN vuong goc vs MC ( theo qh tu vuong goc den //) maf xet tam giac MNC co P la td cua NC theo tc dg trung tuyen trong tam giac vuong suy ra mp=1/2 NC

A/ am= 5 cm

B/ hcn

theo tc duong tb trong tam giac ta co qn//ab ; mn//cd;mp//ab; qp//cd tu do suy ra mnpq la Hcn theo DHNB tu giac co 3 goc vuong

vi o la gd cua hai dg cheo nen oa = oc ma ai=ij=jc nen oi=oj