Mathematics, 22.07.2021 18:10 zibnmustafah

Các mệnh đề sau đây đúng hay sai? a) Hai tam giác bằng nhau khi và chỉ khi chúng có diện tích bằng nhau.
b) Hai tam giác bằng nhau khi và chỉ khi chúng đồng dạng và có một cạnh bằng nhau.
c) Một tam giác là tam giác vuông khi và chỉ khi nó có một góc bằng tổng của hai góc còn lại.
d) Một tam giác là tam giác đều khi và chỉ khi nó có hai phân giác bằng nhau và một góc bằng 60 độ

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