Isosceles triangle
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perimeter of triangle is sum of three sides i.e if a,b,c are three sides of triangle then perimeter is a+b+c. coming to your question answer is 13+5+x
Wiki will not help you cheat. You need to work the problem so you can pass the class and the next test. So, get to work.
There cannot be a "medium triangle with 5 sides". A triangle can have 3 sides and only 3 sides. Any other number of sides and it is not a triangle.
Isosceles
A triangle, by definition, has three sides. A polygon with five sides is called a pentagon.