Is the statement "Angular position $\theta$ is a scalar,whereas angular displacement is a vector" correct?

An athlete runs along a circular track of diameter $80 \ m$. The distance travelled and the magnitude of displacement of the athlete when he covers $3/4$th of the circle is (in $m$):

$A$ particle executing uniform circular motion has:

The ratio of the angular speed of the hour hand of a clock to the angular speed of the minute hand is .......

"$A$ particle moving with constant speed on a circle about a fixed axis has a constant angular velocity,but its linear velocity is not constant." Is this possible? Why?

In uniform circular motion,