Transcript College Placement Test If θ is an acute angle and sin θ = 1/2, then cos θ = A.

College Placement Test
If θ is an acute angle and sin θ = 1/2, then cos θ =
A.  1
B. 0
1
C.
2
D.
E.
3
2
2
D.
3
2
Explanation:
Recall: Soh Cah Toa
opp 1
sin 

hyp 2
adj adj
cos 

hyp
2
2
1

Use the Pythagorean
Theorem to find the
adjacent length…
1  adj  2
1  adj  4
adj  3
adj  3
2
adj
2
2
2
adj
3
cos 

hyp
2