Before I can help, I need the optional answers.
Square root of 81 is 9.
Each side is 9 cm.
9 times 4 (4 being the sides of the square) = 36
Perimeter=36
100000000+10000000+9000000+3= 119000003
Please check out the attached photo
Answer:
13.568/2.12= 6.4
92.565/56.1= 1.65
Sorry I couldn't give u an explanation but I hope this helps u alot and I checked twice to make sure it was right too, But just to double check, Check it again yourself with an calculator! Glad I could help u!