Answer
19%
Work Step by Step
The area of the second square is $\frac{81}{100}*100=81$% of the area of the first square
The decrease is 100-81=19%
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.