
Câu hỏi về tam giác
Quiz
•
Mathematics
•
10th Grade
•
Practice Problem
•
Medium
C3 Hue
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10 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Câu 1: Cho tam giác bất kỳ có BC=a,AC=b,AB=c. Đẳng thức nào đúng?
a2=b2+c2-2bccosA.
a2=b2+c2-2bccosB.
c2=b2+a2+2abcosC.
c2=b2+a2-2abcosA.
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Câu 2: Cho tam giác có a=8,b=10, góc C bằng 60∘. Độ dài cạnh là?
c=321.
c=72.
c=211.
c=221.
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Câu 3: Tam giác ABC có a=8,c=3,B=60∘. Độ dài cạnh b bằng bao nhiêu?
9.
97
7.
61.
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Câu 4: Cho △ABC có AB=9;BC=8;B ^=60∘. Tính độ dài AC.
73.
217.
8
113.
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Câu 5: Cho tam giác ABC có AB=2,AC=1 và A=60∘. Tính độ dài cạnh BC.
BC=2.
BC=1.
BC=3.
BC=2.
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Câu 6: Cho a;b;c là độ dài 3 cạnh của tam giác ABC. Biết b=7;c=5;cosA=45. Tính độ dài của a.
32.
722.
238.
6.
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Câu 7: Cho tam giác bất kỳ có BC=a,AC=b,AB=c. Đẳng thức nào đúng?
cosA=(a2+b2-c2):2ab.
cosA=(b2+c2-a2):2bc.
cosA=(a2+c2-b2):2ab.
cosA=(a2+c2+b2):2bc.
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