Find the original dimensions of the square cardboard sheet.

Question

From a square cardboard sheet, a 3cm wide strip was cut away. The area of the emailing cardboard sheet is 70cm.

Answer 1

The formula for the Area of a square is A = S x S, or A = S²

 

In this case, A = 70cm², so the square root of 70cm² = S

 

S = 8.36cm

 

therefore, the original dimension of each side was 8.36cm + 3cm = 11.36cm