Calculate a side using cos, sin, tan

CONCEPTS

Tips

• Find the sides using sohcahtoa

• Draw out the triangles when completing these problems

PRACTICE PROBLEMS

Question 1 Given sin C = 4/5 and the length of AB = 10. What is the length of AC (see figure below)?

-- Answer -- 12.5

sin θ = 10/AC = 4/5

AC = 12.5

Question 2 For triangle ABC, angle B is 90°. Angle A is 20° and BC is 6. What ix AC?

-- Answer -- 0.057

sin 20° = 6/x

0.342 = 6/x

x = 0.057

ACT PRACTICE PROBLEMS

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