Skip to content
free
K
1
2
practice
Home
Math
English
Science
Social Studies
Contact
Language
English
Español
Sign In
/
Math
/
Trigonometry
/
Law of Sines and Law of Cosines for general triangles
Worksheet
Grade Level
Trigonometry
TRIG.109 Law of Sines and Law of Cosines for general triangles
0%
Skill Level
🔴 Hard
00:00
Progress to Next Level
25% to Medium
Easy
Medium
Hard
Mastery
100%
A student wants to find angle A in a triangle with side lengths a=15, b=18, and c=22. What should the student do first?
A
Use Law of Cosines with cos(A)=(18
2
+22
2
-15
2
)/(2(18)(22))
B
Use Law of Sines with sin(A)/15=sin(18 degrees)/22
C
Use K=(1/2)(18)(22)sin(A) because all angles are missing
D
Use A=180-15-18-22
Submit Answer
