Perimeter equals all sides added together so you would add all the numbers given together. For the side, without a number, you take the number above it and subtract 40.5 by 17.5 and that's your missing number. I think the answer is A. 143.1.
Hope this helps!
Answer:
0.63 or 63/100
Step-by-step explanation:
Answer:
I got 0.475 hope it helps!
ohh sorry didn't see the answer as a fraction part.
I tried it again and got 19/40 I hope you get it right!