To find the perimeter of a rectangle or square you have to add the lengths of all the four sides. x is in this case the length of the rectangle while y is the width of the rectangle. The perimeter of a triangle is the sum of all its three sides. We can work out the perimeter using the following formula: Perimeter of a triangle = sum of all three sides. If a, b and c are the sides of the triangle, then. Perimeter of triangle = a + b + c.
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