Resizing a triangle with a scalar value

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I have came across a really sticky problem here. I am asked to resize a triangle by a given scalar value. (I am given the co-ordinates of the 3 vertices and the center of triangle can easily be evaluated as a result).That would be all. Thanks in advance

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It's simply multiplying the (x,y) co-ordinates of each vertex by square root of the desired scalar value.