Question

bai 8 ; cho hinh chu nhat abcd . ke an,cm cung vuong goc voi bd .

a ) chung minh dn = bm .

b ) chung minh tu giac ancm la hinh binh hanh.

c) goi k la diem doi xung voi a qua n . tu giac dkcb la hinh gi . chung minh .

d ) tia am cat tia kc tai p . chung minh cac duong thang pn,ac,km dong quy .