No but a right angle triangle has perpendicular sides and an hypotenuse.
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Obtuse triangles can also be scalene if none of the sides are of equal length. Otherwise, it is an isosceles triangle.
One way is they both are triangles and have 3 sides.
No, a scalene triangle is simply a triangle where all angles are not equal and all side lengths are not equal, therefore they can or cannot be obtuse.
Similarities between these and all triangles are:They all have 3 sides and 3 angles. The sum of the three angles adds up to 180°.An acute angle is less than 90 degrees. An acute triangle has all three sides are acute.An obtuse angle is more than 90 degrees. An obtuse triangle has one angle which is obtuse, and because of the 180° rule above, the other two angles will be acute.So all triangles will have at least two acute angles.
Not always, sometimes two obtuse triangles are similar and sometimes they are not similar.