Perimeter . . . add up the lengths of all three sides.
Area . . . multiply (half the length of the base) by (the height).
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To find the perimeter you add and to find the area we multiply.
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.
You simply just add up all of the sides
You find the three sides of the triangle, and assure that they are all in the same unit, and then add the sides together to find the perimeter of the triangle.