A square of cardboard is taped at the perimeter by a piece of ribbon 20cm…

A square of cardboard is taped at the perimeter by a piece of ribbon 20cm long. What is the area of the board?

Correct Answer: Option C

Explanation

Area of a square = 4(5) where S is each sides of the square
Perimeter = 20(given)
4S = 20
S = (frac{20}{4})
= 5
Area s² = 5²
= 25