Perimeter: add the three sides.
Area: Use the formula area = (1/2) x base x height. Please note that the height must be measured perpendicular to the base. Depending on the data known, you might also use other formulae; for example, if you know the lengths of the three sides, you can use Heron's formula - if you need it, look it up on the Wikipedia.
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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