Fermi
·
Concept Library
·
Courses
·
Books
·
Problems
·
Simulations
·
Math Wiki
·
High School
Fermi
›
Problems
Mathematics
Mathematics
Problem
A line
A
B
AB
A
B
in three-dimensional space makes angles
45
∘
45^\circ
4
5
∘
and
120
∘
120^\circ
12
0
∘
with the positive
X
X
X
-axis and the positive
Y
Y
Y
-axis, respectively. If
A
B
AB
A
B
makes an acute angle
θ
\theta
θ
with the positive
Z
Z
Z
-axis, then
θ
\theta
θ
equals a.
30
∘
30^\circ
3
0
∘
b.
45
∘
45^\circ
4
5
∘
c.
60
∘
60^\circ
6
0
∘
d.
75
∘
75^\circ
7
5
∘
Browse the problem library