Angles around a point, volume of a cuboid, and trigonometry problem. Find x, the volume, and angle theta.

The angles $x$, $2x$, $3x$, and $4x$ are angles around a point. The sum of angles around a point is $360^\circ$.

The value of $x$ is $\boxed{\text{C. } 36^\circ}$.

54)

The volume $V$ of a cuboid is given by the formula:

Given: length = 6 cm, width = 3 cm, height = 2 cm.

The volume of the cuboid is $\boxed{\text{D. } 36 \text{ cm}^3}$.

55)
To find the angle $\theta$ in a right-angled triangle, at least two side lengths or one side length and another angle (besides the right angle) must be known. In the provided diagram, only one side length (6 cm) is given, which is opposite to angle $\theta$. The length of the adjacent side or the hypotenuse is not provided. Therefore, there is insufficient information to determine the value of $\theta$.