Triangles

identifying triangles 1 more than 3 sides  not a triangle 3 sides  triangle less than 3 sides  not a triangle 3 sides, but some curved  not a triangle

identifying triangles 2 no yes

parts of a triangle A B C vertex angle A side AB side AC angle B side BC angle C C vertex

types of triangles 1 all sides are equal so they are equilateral triangles

types of triangles 2 Which side is different? Are all sides equal? Which side is not? In this one? Are all sides equal for this one? Which side is not equal to the other sides? 2 sides are equal in each so they are isosceles triangles

types of triangles 2 X Y Z A B C D M S P Q R Which 2 sides are equal? How are these angles? Which side is the largest?

types of triangles 3 Which sides? Are any pair of sides equal? No pair of sides is equal so they are scalene triangles

types of triangles 4 all angles are acute so they are acute angled or acute triangles

types of triangles 5 1 angle is right so they are right angled or right triangles

types of triangles 6 1 angle is obtuse so they are obtuse angled or obtuse triangles