if it does have corners its not a triangle
Depending on how you use it, another word for it could be vertex, like in an isosceles triangle, or peak, if used in a pyramid.
Equilateral triangle, regular triangle.
The expanded binomial is another name for Pascal's triangle.
Another name is its correct name: an isosceles triangle.
Altitude is another word for a height of a triangle.
90 degree triangle
A triangle with all equal sides....?
if it does have corners its not a triangle
trio, threesome, triple
angle under 90 degrees
Depending on how you use it, another word for it could be vertex, like in an isosceles triangle, or peak, if used in a pyramid.
Equilateral triangle, regular triangle.
The word triangle for atmosphere would be "hydrosphere, lithosphere, atmosphere."
An equilateral triangle can also be called a "regular" triangle
The Latin word for triangle is trianguli. A triangle is defined as a closed plane figure having three sides and three angles.
The expanded binomial is another name for Pascal's triangle.