2. Calculate the area of the digital board

There is a triangular digital board in a road with a message "WEAR HELMET, KEEP YOUR HEAD SAFE". If the sides of the board are 20 \(dm\) , 21\(dm\) and 29 \(dm\), find the area of the digital board.
 
Area of the digital board \(=\)  \(dm\) \(^2\)
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