From the information given in the question, the only possible conclusion is:
If angle 1 is measured and angle 7 is measured, the two measurements will be identical.
If angle 1 and angle 7 are related to a particular shape or drawing, then additional conclusions may be possible, but we'd need to see the shape or drawing.
To make a dot plot, make a numbered line and add dots above the numbers of the given ages. If there are more than one of the same number, add a dot above the dot already there.
