Trisection = divide into 3. So the answer is in the question.
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The area doubles if the base stays the same.
The area gets doubled.
Just moving a triangle, or rotating, or even reflecting (without scaling) a shape will not change its area or its perimeter.
If the altitude is not changed, the area would be doubled.
If the linear dimensions are doubled, the area is multiplied by (2)2 = 4 .