Cho doan thang d . Ve them 4 diem M,N ,P,Q theo thu tu ay . Ve diem A khong nam tren duong thang d.
a) Ve tia AM, tia QA
b)Ve duong thang AN va duong thang AP.
c) hinh tren co bao nhieu doan thang?
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Nếu ko có 3 điểm nào thẳng hàng thì vẽ đc 45 đường thẳng và 90 tia