It is a triangle all of whose sides are unequal, and one of whose angles is greater than 90 degrees.
That an obtuse angle must be less than 180 degrees is redundant because the sum of all three angles of the traingle add to 180 degrees and each of them mus be smaller.
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An obtuse scalene triangle.
A triangle can be constructed into any of the given formats.
No, a scalene triangle is simply one that has three unequal sides. An obtuse triangle is one that has one angle of greater than 90 degrees. As an example, this page shows three different scalene triangles: http://mathworld.wolfram.com/ScaleneTriangle.html The one on the left is a right triangle. The one in the middle is obtuse. The one on the right is acute.
Absolutely false. A scalene triangle by definition has no side equal to another. An isosceles triangle by definition has two equal sides.
equilateral triangle, scalene triangle, and isoceles triangle Also, acute, obtuse, and right