Add all 3 side lengths.
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perimeer of the triangle = sum of all the sides = 18 +18+11= 47 cm hence perimeter is 47 cm
any triangle is a triangle
acute angled triangle,right angled triangle,obtuse angled triangle,isosceles triangle,equilateral triangle, scalene triangle
An equilateral triangle perhaps depending on your meaning of 'ON the triangle'
equilateral triangle , isosceles triangle , scalene triangle