Any triangle that is not a right angle triangle
It is a scalene triangle other than a right angle triangle
yes
triangle
You need the measures of two sides and for the triangle to be a right triangle to figure out the third side.
No
It is a scalene triangle other than a right angle triangle
Any triangle that is not a right angle triangle
Yes.
yes
triangle
You need the measures of two sides and for the triangle to be a right triangle to figure out the third side.
A right angle triangle.
If no two sides of a triangle have the same length, then the figure is called a "scalene" triangle. Some (but not all) scalene triangles are also right triangles.
If a figure has four sides, then it is a quadrilateral; it cannot be a triangle.
isosceles triangle
If it is and equilateral triangle, the perimeter is 12, otherwise it is impossible to figure out without any angle measurements or other sides lengths