Answer:
The correct answer is D. 30°, 60°, 90°; 1, √3, 2
Step-by-step explanation:
Let's find out the solution to this question:
Arc cos (β) = √3/2 = 1.732/2 = 0.866
β = 30°
Let's recall that the ratio of the sides of a triangle 90 - 60 - 30 is:
1 : 2 : √3
β = 30°, α = 60°, r = 2, h = 1, k = √3
The correct answer is D. 30°, 60°, 90°; 1, √3, 2
