单选题
The triangle in Figure 4 has sides measuring 3, 4, and5 units. What is the measure of θ?
A
45°
B
30°
C
60°
D
36.9°
E
53.1°
单选题
g((f2)) = ______.
A
-2.5
B
-2
C
-1.5
D
2
E
4
单选题
-9cos2θ- 9sin2θ= ______.
A
0
B
1
C
-1
D
9
E
-9
单选题
The perimeter of the regular hexagon below is 12. What is the length of AB, if A is equidistant from each vertex?
A
1
B
2
C
4
D
6
E
8
单选题
The figure below is formed by inscribing a square in a circle. If the circumference of the circle is 16n, what is the area of the shaded regions?
A
64π- 128
B
64π
C
128
D
32π- 64
E
96π
单选题
In any right triangle, the acute angles are ______.
A
Equal
B
Adjacent angles
C
Vertical angles
D
Complementary angles
E
Supplementary angles
