A ship is on the surface of the water, and its radar detects a submarine at a distance of $238 \mathrm{m}$ away underwater, at an angle of depression of $23°$. Find the depth of the submarine.

Find $x$ in the following diagram.

Find the missing length $x$ in the following diagram.

Find $x$ in the following triangle.

Find $x$ in the following triangle.

Find the angle $\theta$.

Find the distance $m$ in the diagram.

Find the heights from the ground of $A, B$ and $C$.

Find the side length $x$ in this diagram.