Question 32
TrigonometryFind the value of θ in the diagram above.
- A.30°
- B.60°
- C.100°
- D.120°
Show the answer and explanation
Answer: D (120°)
Explanation
The triangle has two sides l and base √3 l. Half the base is (√3/2)l, so each base angle has cosine √3/2 and is 30°. Then θ = 180° − 60° = 120°.