Congruent Triangles

Triangle is a polygon with 3 sides.

Acute triangle has all acute angles.
Obtuse triangle has one obtuse angle.
Right triangle has one right angle.
Equiangular triangle has all congruent angles.

Scalene triangle has no congruent sides.
Isosceles triangle has two congruent sides.
Equilateral triangle has all congruent sides.

Ways to prove triangle congruent:  SSS, SAS, ASA, AAS

Give type of trianlges:

1. Triangle ABC has AB = BC.

2. Triangle DEF has an angle measuring 120 degrees.

3. Triangle GHI has no equal sides.

4. Triangle KLM has an angle measuring 90 degree.

5. Triangle XYZ has all congruent angles.

6. Triangle QRS has all congruent sides.