tren tia Ax lay hai diem B va C sao cho AB=2cm,AC=8cm
a/ tinh do dai doan thang BC
b/ goi M la trung diem cua doan thang BC tinh do dai BM
c/ ve tia Ay la tia doi cua tia Ax tren tia Ay lay diem D sao cho AD=2cm
chung to rang diem A la trung diem cua doan thang BD
giup minh ve hinh cho minh nhanh len minh dang gap ve ca hinh cho to nua nhanh to like
Ban tu ve hinh,mk ko biet cach ve
a/Diem B la diem nam giua A va C vi AB<AC(2cm<8cm)
Ta co:AB+BC=AC
2 +BC= 8
BC=8-2=6 cm
b/Vi M la trung diem cua doan thang BC nen BM=CM=BC:2=6:2=3 cm
c/Diem A la diem nam giua B va D vi B va D la hai tia doi nhau chung goc A
Diem A la trung diem cua doan thang BD vi:
+A nam giua D va B
+AD=AB=2 cm
ddkkmm