well, i don't really know but my teacher said equal.
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opposite angles
An adjacent angle
Adjacent angles have a common side and a common vertex.
Yes (supposing that by side you mean ray...angles don't have sides because they are 2D, not 3D.) If you have a point and you draw four random rays from that point, that only meat at that point, then you would have created four angles. The two angles on opposite sides of the point will share a vertex, but not a RAY.
Yes, since the vertex is a point and the vertical angles share that point.