It is an acute triangle.
A right(-angled) triangle
Is called a scalene triangle.
A triangle having 3 congruent sides is an equilateral triangle
A scalene triangle is a triangle that has three unequal sides.
You can't without having incomplete units.
I believe that is called a Scalene triangle.
There is no such thing as a regular isosceles triangle. The only regular triangle is an equilateral triangle. Having said that, any triangle will produce regular tessellation.
Having faith in the unknown.
the same, "kwanzaa" - but note that is completely unknown in France and that nobody would understand the concept without having a look at Wikipedia.
A triangle with 3 equal sides is called an equilateral triangle.