Why can't the law of sines be used initially in this problem?
How to use law of cosines to find the missing angles of a triangle given SSS

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Mathematics
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9th - 10th Grade
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Hard
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7 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Because the triangle is equilateral.
Because the side lengths are not proportional.
Because the triangle is not a right triangle.
Because no angles are given.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the first step in using the law of cosines for this problem?
Find the smallest angle.
Find the largest angle.
Find the angle opposite the smallest side.
Find any angle.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which angle is calculated first using the law of cosines?
Angle B
Any angle
Angle A
Angle C
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the value of angle C after calculation?
122.88 degrees
45 degrees
60 degrees
90 degrees
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why is it important to find the largest angle first?
To avoid using the law of sines.
To ensure the other angles are obtuse.
To ensure the other angles are acute.
To simplify the calculation of side lengths.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How is angle A calculated after finding angle C?
Using the law of sines.
Using the triangle angle sum theorem.
Using the law of cosines again.
Using the Pythagorean theorem.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What theorem is used to find the final angle B?
Triangle angle sum theorem
Pythagorean theorem
Law of cosines
Law of sines
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