A scalene triangle has 3 unequal sides whereas an isosceles triangle has 2 equal sides
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A scalene triangle is a triangle in which all three sides have different lengths. The difference between a scalene right triangle and a scalene obtuse triangle is that in the first one, we can find the measure length of the third side when we know the lengths of the two other sides, and in the second one we cannot.
An isosceles triangle has two equal side; a scalene triangle has no two equal sides.
An isosceles triangle has two (or more) sides of equal length, while a scalene triangle has no correlation between side lengths/angle size.
Because a scalene triangle has all sides are difference
In an acute triangle, all angles are smaller then 90%, In a obtuse triangle, there is normally one angle greater then 90%. A easy way to remember acute triangle, is it has the word "cute" in it.