Having three unequal sides of a triangle is called scalene
an angle can be acute angle (<900), right angle (900) and obtuse angle(>900)
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Yes. A scalene triangle is one in which all sides and angles are different. An obtuse triangle is one in which the largest angle is greater than 90o. An example of an obtuse scalene triangle would be one with angles 100o, 50o & 30o.
Yes.eg The triangle with sides 7 cm, 8 cm, 13 cm is both obtuse (angle opposite side of 13 cm is 120o) and scalene (none of the sides are equal).
Yes, but its complement is negative.
No, because if there is on obtuse angle the triangle will always be obtuse.