A pair of triangles can form a 4 sided quadrilateral
They are congruent triangles.
trapezoid
Trignometry
Some triangles are equilateral, but not all of them. There are three types of triangles. Triangles which have three equal sides and three equal angles are called equilateral triangles. Isosceles triangles have two equal sides and two equal angles. Scalene triangles have no equal sides and no equal angles.
Some, but not all. Triangles with 2 congruent sides are called isoceles triangles. Triangles with 3 congruent sides are called equilateral triangles.
The set of all triangles, probably.
Similar triangles
A pair of triangles can form a 4 sided quadrilateral
They are congruent triangles.
trapezoid
Trignometry
hexagon
There is no word for the fear of boogers
what is the fear of dusbins called ?
Those would be SIMILAR triangles.
if you're talking about 2 triangles that overlap, then yes and they are called overlapping triangles. XD