Not sure what a "quadrilaters" is.
A quadrilateral is a plane (2-dimensional) figure with four straight sides. It can have all four angles different. It can have two congruent angles (kite), 3 congruent angles (no specific name), 2 pair of two congruent angles (parallelogram/rhombus), or four congruent angles (rectangle/square).
No but an equilateral triangle does.
No but an equilateral triangle does.
A quadrilateral never has exactly 3 congruent angles. It can have none, two, two pairs of two, or four.
sometimes
sometimes
A triangle with three congruent angles
All three sides are congruent (equal in length); all three angles are congruent (same measure).All three sides are congruent (equal in length); all three angles are congruent (same measure).All three sides are congruent (equal in length); all three angles are congruent (same measure).All three sides are congruent (equal in length); all three angles are congruent (same measure).
Equilateral triangles have three congruent sides and three congruent angles
A quadrilateral shape has four sides and four internal angles. A triangle has three sides and three internal angles. Therefore there is no such thing as a quadrilateral triangle.
an equilateral triangle
Equilateral TriangleThis triangle has all three sides and all three angles congruent.
An equilateral triangle.