No not all obtuse triangular are similar. :)
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No, because they only have the limitations of 91 degrees (lowest obtuse angle) and 179 degrees (highest obtuse angle). Two obtuse angles could be either of them or anything in between.
Only right triangles.
yes a isosceles triangle has a right,obtuse and acute angle.
Triangles whether acute, obtuse, equilateral or scalene will only ever have angles that add to 180 degrees.
Only if they have the same angles