Answer:
70cm
Explanation:
perimeter generally refers to addition and you would add the length of every side of the square or you can multiply the length of one side and the sides that are the same length by the number of sides for that shape so 17.5 times 4 and be done by adding 17.5 to 17.5 to get 35 and then you can multiply 35 by 2 to get 70