Question

a chess board contain 64 equal squares and the area of each square is 6.25cm^2. a border round the board is 2cm wide. find the length of the side of the chess board.​

Answer 1

side length of the square board= x

Area of one square in the chess board = 6.25 cm²

Area of 64 squares = 64 x 62.5

(x – 4)² = 400      

 (x – 4)  = √400

 (x – 4)  = √20 x 20

x – 4 = 20

x = 20 + 4

x = 24 cm