单选题 The triangle in Figure 4 has sides measuring 3, 4, and5 units. What is the measure of θ?
45°
30°
60°
36.9°
53.1°
单选题 g((f2)) = ______.
-2.5
-2
-1.5
2
4
单选题 -9cos2θ- 9sin2θ= ______.
0
1
-1
9
-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?
1
2
4
6
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?
64π- 128
64π
128
32π- 64
96π
单选题 In any right triangle, the acute angles are ______.
Equal
Adjacent angles
Vertical angles
Complementary angles
Supplementary angles