Answer:
To find angle y you subtract the two angles form 180 degrees because it is a straight line. Then you subtract angle y and 72 from 180 because a triangle adds up to 180 degrees and you get angle x.
Hope this helps, ask if you have any more questions!
Answer:
A) 180º
Step-by-step explanation:
i wont be symmetric at 90º or 270º or 120º or 240º. and it has rotational symmetry
Answer:
decagon = 10
nonagon = 9
dodecagon = 12
Step-by-step explanation:
