Sum of dimensions of all sides
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Without knowing any other property of that triangle, you can't.
If it is and equilateral triangle, the perimeter is 12, otherwise it is impossible to figure out without any angle measurements or other sides lengths
Perimeter is the distance around the figure. Add all sides. Area depends on the figure. Triangle --- 1/2 bh Rectangle --- lw. Others --- divide into triangles and find the area of each triangle then add all together.
Yes, the perimeter of any figure is the sum of all the sides.