The perimeter of a triangle is the sum of its 3 sides.
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The formula is Perimeter = Length of side 1 + Length of side 2 + Length of side 3.
The formula for measuring the area of a square is s2, where s is the length of one of the sides. The perimeter would be 4s.
You add all the sides of the pentagon together.
Assuming you mean perimeter (not pirimeter) and triangle (traingle) you need to sum together the lengths of the three sides.
Assuming that what you call a "traingle" is actually a triangle, the formula is that one of the vertices has a measure of 90 degrees.
Use Pythagoras' theorem to find the hypotenuse which works out as 25cm Perimeter = 25+24+7 = 56cm