The fact that it has a 30 perimeter tells you nothing about the triangle's angles and very little about the lengths of its sides. The name, if it has any, is indeterminate.
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With sides of 5 and 12, you can make a triangle with any perimeter you want between 24 and 34. If you call them "legs" because they are the sides of a right triangle, then the hypotenuse is 13, and the perimeter is 30.
how do you construct a triangle which has a perimeter of 120 and the base angles abc be 30 and 45 degrees
The perimeter of a triangle is the sum of its 3 sides
The perimeter of a triangle is the sum of its 3 sides