Lengths of: equal side+equal side+base = perimeter
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I don't see any isosceles triangle below.In general, the perimeter is the sum of the lengths of all sides. Note that in an isosceles triangle, two of the three sides have the same length.
You cannot since there is insufficient information.
24cm each
Use the distance formula to calculate the distances between the three vertices. If they are all different, the triangle is scalene, if only two are the same, the triangle is isosceles, and if they are all the same, the triangle is equilateral.
Perimeter of a triangle = (length of the first side) plus (length of the second side) plus (length of the third side)