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Trinhdinhhuy
2 năm trước
Cho hình tròn tâm O , đường kính AB = 8cm. A) Tính chu vi hình tròn tâm O, đường kính AB; hình tròn tâm M, đường kính OA và hình tròn tâm N, đường kính OB. B) So sánh tổng chu vi của hình tròn tâm M và hình tròn tâm N với chu vi hình tròn tâm O. ( chỉ em với ạ)
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