10 rays can meet in 45 vertices. At each such vertex there will be 4 angles which makes 180 angles in all.
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Ten.Each angle is determined by two rays, so the answer is equivalent to the number of combinations of 2 out of 5 = 5*4/(2*1) = 10
A pentagonal prism has 10 right angles, formed from perpendicular edges. It has one for each angle made when a face meets a base. Since it has 5 faces and 2 bases, there are 10 right angles.
A square has 4 angles, so ten squares have 10*4 = 40 angles.
There can be 10 obtuse angles. If there are no reflex angles there can by up to three acute angles (I think).
36 sides.