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

What is the direction of velocity at any point on the circle for a particle undergoing uniform circular motion?

$A$ particle moves along a circular path of radius $r$ with uniform speed $v$. The angle described by a particle in one second is

What is uniform circular motion? By using a proper figure,derive the equation for centripetal acceleration $a_c = \frac{v^2}{r}$ for uniform circular motion. Show that its direction is towards the center.

$A$ particle moves with a constant speed $v$ along a circle of radius $R$. What is the change in velocity of the particle as it moves from point $P_1$ to $P_2$?

$A$ stone tied to the end of a string $1\,m$ long is whirled in a horizontal circle with a constant speed. If the stone makes $22$ revolutions in $44$ seconds,what is the magnitude and direction of the acceleration of the stone?