A acute angled scalene triangle.
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That would be an equilateral triangle.
It depends what kind of triangle it is. For example, it can be 20 by 20 by 5.
The figure is a triangle. That means it has 3 sides. The triangle is "equilateral". That means all three sides have the same length. One side is 5 cm. That means each of the other 2 sides is also 5 cm. So the perimeter is (5 + 5 + 5) = 15 cm.
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.
A triangle, by definition, has three sides. A polygon with five sides is called a pentagon.