A tube is a type of cylinder, which has two circular faces, one at each end. It also has three edges - two circular edges around the faces and one curved edge around the side. A tube has no vertices, as vertices are defined as the points where edges meet, and a tube's edges do not meet at any points.
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Tube has 2 faces and 0 vertices
That shape is called a triangular prism. A prism is made of rectangles arranged in a tube with any 2D shape at the ends. This shape determines what kind of prism it is, you can get pentagonal, hexagonal, and many other types of prism.
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At this angle the biggest "area" of the test tube is covered by the flame. Thus it heats up quickly and evenly. Also, by holding the test tube at 45 degrees away from you, you're less likely to be splashed by anything in the test tube boiling over.
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