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If the side of a chess board is smaller than its perimeter by 21cm, then find the side of the chessboard.

Find the number of squares in chess board.

- A chess board of each side 34cm.find its perimeter

Number of rectangles on a chess board is

Number of unit squares in a chess board is

Find the side of a square notice board whose perimeter is 120 cm.

A chess board contains 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.

A traffic signal board, indicating ‘SCHOOL AHEAD’, is an equilateral triangle with side a. Find the area of the signal board, using Heron’s formula.If its perimeter is 180 cm, what will be the area of the signal board?