Never mind. I finally figured it out after I look into the rb code. I just use the scale tool and type in a ratio = square root of (new area/old area).
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L
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RE: [Plugin] Scale Face to Target Area - TIG
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RE: [Plugin] Scale Face to Target Area - TIGThanks TIG. It's a very useful tool. Is there a way to scale the other faces with the same ratio? The plugin only scale the selected face, but the remaining faces remain unchanged as shown below:  Please let me know. Thank you so much again! Best regards, 
 Leo