Tổng 3 góc trong 1 tam giac Lecturer Maker

P.E Onimusha - Thân tặng !
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Đo góc của ∆:
Tổng các góc của tam giác ABC là: latex(angle(A)+ angle(B) + angle(C) = 78,5^0 + 56,5^0+ 45^0 = 180^0) Cắt ghép hình:
Ba góc ghép lại tạo thành góc bẹt Chứng tỏ tổng ba góc của tam giác bằng latex(180^0) Cắt một tấm bìa hình tam giác ABC, cắt rời góc B ra rồi đặt nó kề với góc A, cắt rời góc C ra rồi đặt nó kề với góc A. Hãy nêu dự đoán về tổng các góc A,B,C của tam giác ABC B A C