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a: Trên tia Oa, ta có: OC<OD
nên điểm C nằm giữa hai điểm Ovà D
b: Ta có: C nằm giữa O và D
nên CO+CD=OD
hay CD=2,5cm
c: Ta có: C nằm giữa O và D
mà CO=CD
nên C là trung điểm của OD
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d nằm giữa hai điểm còn lại k mình nhé
Bài 1: V
Bài 2: A