If you mean triangles with angles of 30 60 and 90, then not necessarily These are the angles, and they do not give you the absolute side lengths. If you mean a triangle with the sides of 30, 60, and 90, that triangle can't exist, since the largest side length of a triangle cannot be equal to or greater than the sum of the other two sides.
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No because 30-60-90 triangles are right angle triangles
because 30 and 60 makes 90
fd 60,bk 30,rt 90,fd 30,lt 90,fd 30,bk 60
30-60-90 45-45-90
A 30-60-90 right triangle is one in which the three angles of the triangle 30, 60 and 90 degrees. The length of the sides of such a triangle have the ratio 1:2:square root of 3. The 1 is opposite the 30 degree angle, the 2 is opposite the 60 degree angle and the square root of 3 is opposite the 90 degree angle.