A vector $\overrightarrow A $ points vertically upward and $\overrightarrow B $points towards north. The vector product $\overrightarrow A \times \overrightarrow B $ is
Zero
Along west
Along east
Vertically downward
Projection of vector $\vec A$ on $\vec B$ is
If $\overrightarrow A \times \overrightarrow B = \overrightarrow C + \overrightarrow D,$ then select the correct alternative-
Show that the area of the triangle contained between the vectors $a$ and $b$ is one half of the magnitude of $a \times b .$