Assuming that neither of the sides of equal length is the base,
Perimeter = Base + 2*Slanted sides.
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The perimeter of any triangle is the sum of its 3 sides.
If the base of an isosceles triangle is 11 and its perimeter is 39, then it has a height of 12.87.
The answer depends on what information you have but, basically, you need to add together the lengths of the three sides of the triangle.
It is the sum of the lengths of its sides.
Perimeter of the isosceles triangle: 16.2+16.2+8.1 = 40.5 cm