A Particle Acted on by Force

A particle with mass 2.13 kg has position \vec{r} and velocity
\vec{v} (see picture.) It is acted on by the force \vec{F}.
All three vectors lie in a common plane. Given: r=2.91m,$$v=4.18\frac{m}{s}
and F=1.88N. compute (a) angular momentum of the particle and (b)
torque about the origin, acting on the particle. What are the directions
of these two vectors?
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