Similar, YES. Congruent, NO.
No. A triangle with 2-inch sides is not congruent with a triangle with 3-inch sides.
No. A triangle is similar to one that is twice its size but the two are not congruent.
an equiangular triangle (and by definition, equilateral triangles are always equiangular too)
An isosceles triangle has at least two congruent sides. An equilateral triangle has three congruent sides. So, an equilateral triangle is a special case of isosceles triangles. Since the equilateral triangle has three congruent sides, it satisfies the conditions of isosceles triangle. So, equilateral triangles are always isosceles triangles. Source: www.icoachmath.com
No, congruent triangles are always similar but similar triangles and not always congruent. Imagine that similar triangles can be created on a copy machine enlarge and shrink the image, turn it, even turn it over, the angles remain the same. A congruent triangle must be exactly the same as the original. Hope this helps!
Yes because the definition of a congruent triangle is a triangle with EVERY side the same length
Yes because the two sides of a triangle that are the same lenth are congruent.
If you mean an isosceles triangle then no because all triangles have no diagonals
Yes, that's part of what the word congruent means. Not only do congruent triangles have the same shape they are of the same size, and you can move one of them over the other one so that it covers it exactly.Note that you cannot flip a triangle over and consider it conguent to another triangle.
In an isosceles triangle, two angles, and therefore sides (Base Angle Theorem), are congruent. This does not mean that all isosceles triangles are also right triangles - there is only one (45, 45, 90 triangle).