Uncongruent refers to things that are not in agreement or harmony with each other. In mathematics, it often describes shapes or figures that do not match in size or shape, such as two triangles that have the same angles but different side lengths. In a broader context, it can apply to ideas, beliefs, or actions that conflict or do not align.
Thay aren't. A scalene triangle has 3 uncongruent sides. While an isoceles has only one uncongruent.
A quadrilateral with four congruent sides and uncongruent diagonals is a Rhombus. See related link for a picture
This traingle is an equilateral traingle: which consists of all the three sides and angles to be congruent. The angles inside the triangle, just like any normal traingle, add up to be 180 degrees. The opposite of this traingle is the Scalene triangle which has all the three sides to be Uncongruent and has different angles. All the angles of ALL traingles still add up to 180 Degrees. The Isoceles triangle consists of two equal sides and one extravagantly large one side. Therefore, because of the previous properties, an isosceles traingle has two congruent angles and usually one obtuse or acute angle. The last triangle, the right triangle, has one right angle. It is the only triangle that is capable with triginomical ratios and the Pythagorean Theorem.