Đáp án:
450
Giải thích các bước giải:
Vì tam giác ABC vuông cân tại A => góc A = 90o
=> BˆB^ = CˆC^ =1800−Aˆ/2= 1800−900/2 = 450
Tự vẽ hình nha
Ta có:∠A+∠B+∠C=180(tổng 3 góc trong 1 Δ)
hay 90 + 2∠C +∠C=180
⇔3∠C=180
⇔∠C=60
Ta có:∠B+∠C=90 (phụ nhau)
hay ∠B+60=90
⇔∠B=30
theo em sau khi học xong thời văng lang -âu lạc đã để lại chúng ta những gì
nhân dân ta có câu tục ngữ gần mực thì đen gần đèn thì dạng nhưng có ban lại cho rằng gần mực chưa chắc đã đen gần đèn chưa chắc đã dạng
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