It has 1 set of 3 parallel lines and 3 sets of 2 parallel lines, and 18 angles (3 sides meet at each vertex)
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Three pairs and one triplet. The triplet can be considered three pairs.
A triangular prism has two right angles. Each end of the prism, which is a triangle, has one right angle. The third right angle is formed where the two rectangular sides meet. So, in total, a triangular prism has two right angles.
bcoz in triangular prism, sides are not parallel so rays will deflect but in rectangular prism sides are parallel so rays won't deflect instead they will pass straight.
5 pairs of parallel lines, plus a set of 5 parallels.