Maths Corner Week 4

Week 4

Hello my readers I am sorry for the short break that has been taken since my last post. Though, I have to say, on the last week of the maths corner not a single person answered and because of that I am highly disappointed. Anyway the answer for the last week was 16. Please I encourage more people to answer. That means that Lanre and Omobola remain in the royal family of maths. The question for this week is:

What is the area of a square with a perimeter of 20cm.

Please leave answers in comments below.