See the answer below.
Work Step by Step
a) Since all members of the ring are $sp^3$ hybridized, the angles are approximately 109°. An equilateral triangle has internal angles of 60°, which causes molecular strain. b) Yes, it has asymmetrical polar bonds (CO, vectorial sum doesn't cancel in the axis perpendicular to the CC bond). The oxygen is the most electronegative, thus it has a partial negative charge, and the hydrogens, least electronegative, have a partial positive charge.